Search a number
-
+
16000020 = 22325103863
BaseRepresentation
bin111101000010…
…010000010100
31010002212220100
4331002100110
513044000040
61330534100
7252666201
oct75022024
933085810
1016000020
119039063
125437330
13341288a
1421a6ca8
151610b30
hexf42414

16000020 has 72 divisors (see below), whose sum is σ = 49061376. Its totient is φ = 4220352.

The previous prime is 15999989. The next prime is 16000057. The reversal of 16000020 is 2000061.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 15999966 and 16000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18109 + ... + 18971.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

Almost surely, 216000020 is an apocalyptic number.

16000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24530688).

16000020 is an abundant number, since it is smaller than the sum of its proper divisors (33061356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16000020 is a wasteful number, since it uses less digits than its factorization.

16000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 16000020 is about 4000.0024999992. The cubic root of 16000020 is about 251.9843149724.

Adding to 16000020 its reverse (2000061), we get a palindrome (18000081).

It can be divided in two parts, 160000 and 20, that multiplied together give a 5-th power (3200000 = 205).

The spelling of 16000020 in words is "sixteen million, twenty", and thus it is an aban number and an uban number.

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 103 180 206 309 412 515 618 863 927 1030 1236 1545 1726 1854 2060 2589 3090 3452 3708 4315 4635 5178 6180 7767 8630 9270 10356 12945 15534 17260 18540 25890 31068 38835 51780 77670 88889 155340 177778 266667 355556 444445 533334 800001 888890 1066668 1333335 1600002 1777780 2666670 3200004 4000005 5333340 8000010 16000020