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20211020 = 2252353829
BaseRepresentation
bin100110100011…
…0010101001100
31102000211022022
41031012111030
520133223040
62001105312
7333535154
oct115062514
942024268
1020211020
1110454925
126928238
1342584ab
142981764
151b936b5
hex134654c

20211020 has 48 divisors (see below), whose sum is σ = 45178560. Its totient is φ = 7577856.

The previous prime is 20211007. The next prime is 20211031. The reversal of 20211020 is 2011202.

It is a junction number, because it is equal to n+sod(n) for n = 20210989 and 20211007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23966 + ... + 24794.

It is an arithmetic number, because the mean of its divisors is an integer number (941220).

Almost surely, 220211020 is an apocalyptic number.

20211020 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 20211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22589280).

20211020 is an abundant number, since it is smaller than the sum of its proper divisors (24967540).

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

20211020 is a wasteful number, since it uses less digits than its factorization.

20211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20211020 is about 4495.6668026000. Note that the first 3 decimals coincide. The cubic root of 20211020 is about 272.3930843371.

Adding to 20211020 its reverse (2011202), we get a palindrome (22222222).

The spelling of 20211020 in words is "twenty million, two hundred eleven thousand, twenty".

Divisors: 1 2 4 5 10 20 23 46 53 92 106 115 212 230 265 460 530 829 1060 1219 1658 2438 3316 4145 4876 6095 8290 12190 16580 19067 24380 38134 43937 76268 87874 95335 175748 190670 219685 381340 439370 878740 1010551 2021102 4042204 5052755 10105510 20211020