20724414640 has 20 divisors (see below), whose sum is σ = 48184264224. Its totient is φ = 8289765824.

The previous prime is 20724414631. The next prime is 20724414679. The reversal of 20724414640 is 4641442702.

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

It is a junction number, because it is equal to n+sod(n) for n = 20724414596 and 20724414605.

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, 129527512 + ... + 129527671.

Almost surely, 2^20724414640 is an apocalyptic number.

20724414640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20724414640 is an abundant number, since it is smaller than the sum of its proper divisors (27459849584).

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

20724414640 is a wasteful number, since it uses less digits than its factorization.

20724414640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259055196 (or 259055190 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 34.

The spelling of 20724414640 in words is "twenty billion, seven hundred twenty-four million, four hundred fourteen thousand, six hundred forty".