20666595824 has 20 divisors (see below), whose sum is σ = 45761748144. Its totient is φ = 8857112448.

The previous prime is 20666595809. The next prime is 20666595839. The reversal of 20666595824 is 42859566602.

It is an interprime number because it is at equal distance from previous prime (20666595809) and next prime (20666595839).

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

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, 92261477 + ... + 92261700.

Almost surely, 2^20666595824 is an apocalyptic number.

It is an amenable number.

20666595824 is an abundant number, since it is smaller than the sum of its proper divisors (25095152320).

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

20666595824 is a wasteful number, since it uses less digits than its factorization.

20666595824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184523192 (or 184523186 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 20666595824 in words is "twenty billion, six hundred sixty-six million, five hundred ninety-five thousand, eight hundred twenty-four".