20470856 has 32 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 8256768.

The previous prime is 20470841. The next prime is 20470867. The reversal of 20470856 is 65807402.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9800 + ... + 11703.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^20470856 is an apocalyptic number.

It is an amenable number.

20470856 is an abundant number, since it is smaller than the sum of its proper divisors (25977784).

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

20470856 is a wasteful number, since it uses less digits than its factorization.

20470856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21533 (or 21529 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20470856 is about 4524.4730079867. The cubic root of 20470856 is about 273.5554266044. Note that the first 3 decimals are identical.

The spelling of 20470856 in words is "twenty million, four hundred seventy thousand, eight hundred fifty-six".