20620664400 has 120 divisors (see below), whose sum is σ = 75491301184. Its totient is φ = 4713292800.

The previous prime is 20620664399. The next prime is 20620664401. The reversal of 20620664400 is 446602602.

It is an interprime number because it is at equal distance from previous prime (20620664399) and next prime (20620664401).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620664401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1219021 + ... + 1235820.

Almost surely, 2^20620664400 is an apocalyptic number.

20620664400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20620664400 is an abundant number, since it is smaller than the sum of its proper divisors (54870636784).

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

20620664400 is a wasteful number, since it uses less digits than its factorization.

20620664400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454869 (or 2454858 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 20620664400 in words is "twenty billion, six hundred twenty million, six hundred sixty-four thousand, four hundred".