20624664262640 has 20 divisors (see below), whose sum is σ = 47952344410824. Its totient is φ = 8249865705024.

The previous prime is 20624664262639. The next prime is 20624664262651. The reversal of 20624664262640 is 4626246642602.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128904151562 + ... + 128904151721.

Almost surely, 2^{20624664262640} is an apocalyptic number.

20624664262640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20624664262640 is an abundant number, since it is smaller than the sum of its proper divisors (27327680148184).

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

20624664262640 is a wasteful number, since it uses less digits than its factorization.

20624664262640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257808303296 (or 257808303290 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 20624664262640 in words is "twenty trillion, six hundred twenty-four billion, six hundred sixty-four million, two hundred sixty-two thousand, six hundred forty".