20502656 has 32 divisors (see below), whose sum is σ = 42170880. Its totient is φ = 9918720.

The previous prime is 20502641. The next prime is 20502667. The reversal of 20502656 is 65620502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (1317840).

Almost surely, 2^20502656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20502656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21085440).

20502656 is an abundant number, since it is smaller than the sum of its proper divisors (21668224).

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

20502656 is an equidigital number, since it uses as much as digits as its factorization.

20502656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5212 (or 5200 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20502656 is about 4527.9858657023. The cubic root of 20502656 is about 273.6970028693.

The spelling of 20502656 in words is "twenty million, five hundred two thousand, six hundred fifty-six".