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2155020 = 223572733
BaseRepresentation
bin1000001110001000001100
311001111010120
420032020030
51022430040
6114104540
724213600
oct10161014
94044116
102155020
11124210a
1287b150
135a5b7a
14401500
152c87d0
hex20e20c

2155020 has 72 divisors (see below), whose sum is σ = 7028784. Its totient is φ = 491904.

The previous prime is 2155009. The next prime is 2155057. The reversal of 2155020 is 205512.

It is a super-2 number, since 2×21550202 = 9288222400800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2574 + ... + 3306.

It is an arithmetic number, because the mean of its divisors is an integer number (97622).

22155020 is an apocalyptic number.

2155020 is a gapful number since it is divisible by the number (20) 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 2155020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3514392).

2155020 is an abundant number, since it is smaller than the sum of its proper divisors (4873764).

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

2155020 is a wasteful number, since it uses less digits than its factorization.

2155020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 2155020 is about 1467.9986376015. The cubic root of 2155020 is about 129.1666615794.

The spelling of 2155020 in words is "two million, one hundred fifty-five thousand, twenty".

Divisors: 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 49 60 70 84 98 105 140 147 196 210 245 294 420 490 588 733 735 980 1466 1470 2199 2932 2940 3665 4398 5131 7330 8796 10262 10995 14660 15393 20524 21990 25655 30786 35917 43980 51310 61572 71834 76965 102620 107751 143668 153930 179585 215502 307860 359170 431004 538755 718340 1077510 2155020