20516550641624 has 32 divisors (see below), whose sum is σ = 38936957411520. Its totient is φ = 10133393419296.

The previous prime is 20516550641593. The next prime is 20516550641647. The reversal of 20516550641624 is 42614605561502.

It is a congruent number.

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, 3274499 + ... + 7194125.

It is an arithmetic number, because the mean of its divisors is an integer number (1216779919110).

Almost surely, 2^{20516550641624} is an apocalyptic number.

It is an amenable number.

20516550641624 is a deficient number, since it is larger than the sum of its proper divisors (18420406769896).

20516550641624 is a wasteful number, since it uses less digits than its factorization.

20516550641624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927599 (or 3927595 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 20516550641624 in words is "twenty trillion, five hundred sixteen billion, five hundred fifty million, six hundred forty-one thousand, six hundred twenty-four".