20650974520 has 32 divisors (see below), whose sum is σ = 50688756720. Its totient is φ = 7509445120.

The previous prime is 20650974517. The next prime is 20650974527. The reversal of 20650974520 is 2547905602.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650974527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23466577 + ... + 23467456.

Almost surely, 2^20650974520 is an apocalyptic number.

20650974520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20650974520 is an abundant number, since it is smaller than the sum of its proper divisors (30037782200).

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

20650974520 is a wasteful number, since it uses less digits than its factorization.

20650974520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46934055 (or 46934051 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 20650974520 in words is "twenty billion, six hundred fifty million, nine hundred seventy-four thousand, five hundred twenty".