20651256 has 48 divisors (see below), whose sum is σ = 56216160. Its totient is φ = 6848640.

The previous prime is 20651237. The next prime is 20651261. The reversal of 20651256 is 65215602.

20651256 is a `hidden beast` number, since 2 + 0 + 651 + 2 + 5 + 6 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16161 + ... + 17391.

It is an arithmetic number, because the mean of its divisors is an integer number (1171170).

Almost surely, 2^20651256 is an apocalyptic number.

It is an amenable number.

20651256 is an abundant number, since it is smaller than the sum of its proper divisors (35564904).

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

20651256 is a wasteful number, since it uses less digits than its factorization.

20651256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20651256 is about 4544.3653022177. The cubic root of 20651256 is about 274.3566492502.

Adding to 20651256 its reverse (65215602), we get a palindrome (85866858).

It can be divided in two parts, 2065 and 1256, that added together give a triangular number (3321 = T₈₁).

The spelling of 20651256 in words is "twenty million, six hundred fifty-one thousand, two hundred fifty-six".