20553664 has 28 divisors (see below), whose sum is σ = 41660064. Its totient is φ = 10056704.

The previous prime is 20553647. The next prime is 20553691. The reversal of 20553664 is 46635502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409 + ... + 6424.

Almost surely, 2^20553664 is an apocalyptic number.

It is an amenable number.

20553664 is an abundant number, since it is smaller than the sum of its proper divisors (21106400).

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

20553664 is an equidigital number, since it uses as much as digits as its factorization.

20553664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892 (or 6882 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20553664 is about 4533.6148932171. The cubic root of 20553664 is about 273.9237893433.

The spelling of 20553664 in words is "twenty million, five hundred fifty-three thousand, six hundred sixty-four".