20560456 has 32 divisors (see below), whose sum is σ = 45253440. Its totient is φ = 8572608.

The previous prime is 20560427. The next prime is 20560487. The reversal of 20560456 is 65406502.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 2890 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (1414170).

Almost surely, 2^20560456 is an apocalyptic number.

It is an amenable number.

20560456 is an abundant number, since it is smaller than the sum of its proper divisors (24692984).

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

20560456 is a wasteful number, since it uses less digits than its factorization.

20560456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9973 (or 9969 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20560456 is about 4534.3639024675. The cubic root of 20560456 is about 273.9539589111.

Adding to 20560456 its reverse (65406502), we get a palindrome (85966958).

The spelling of 20560456 in words is "twenty million, five hundred sixty thousand, four hundred fifty-six".