20556464 has 20 divisors (see below), whose sum is σ = 40023480. Its totient is φ = 10227840.

The previous prime is 20556433. The next prime is 20556467. The reversal of 20556464 is 46465502.

It is a self number, because there is not a number n which added to its sum of digits gives 20556464.

It is not an unprimeable number, because it can be changed into a prime (20556467) 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, 332 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (2001174).

Almost surely, 2^20556464 is an apocalyptic number.

It is an amenable number.

20556464 is a deficient number, since it is larger than the sum of its proper divisors (19467016).

20556464 is a wasteful number, since it uses less digits than its factorization.

20556464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308 (or 6302 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20556464 is about 4533.9236870508. The cubic root of 20556464 is about 273.9362275438.

The spelling of 20556464 in words is "twenty million, five hundred fifty-six thousand, four hundred sixty-four".