20472916 has 12 divisors (see below), whose sum is σ = 35861140. Its totient is φ = 10226880.

The previous prime is 20472901. The next prime is 20472919. The reversal of 20472916 is 61927402.

It can be written as a sum of positive squares in 2 ways, for example, as 11532816 + 8940100 = 3396^2 + 2990^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4846 + ... + 8026.

Almost surely, 2^20472916 is an apocalyptic number.

It is an amenable number.

20472916 is a deficient number, since it is larger than the sum of its proper divisors (15388224).

20472916 is a wasteful number, since it uses less digits than its factorization.

20472916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794 (or 4792 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20472916 is about 4524.7006530819. The cubic root of 20472916 is about 273.5646023366.

The spelling of 20472916 in words is "twenty million, four hundred seventy-two thousand, nine hundred sixteen".