20577392440 has 32 divisors (see below), whose sum is σ = 50508146160. Its totient is φ = 7482688000.

The previous prime is 20577392419. The next prime is 20577392441. The reversal of 20577392440 is 4429377502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20577392441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23382961 + ... + 23383840.

Almost surely, 2^20577392440 is an apocalyptic number.

20577392440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20577392440 is an abundant number, since it is smaller than the sum of its proper divisors (29930753720).

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

20577392440 is a wasteful number, since it uses less digits than its factorization.

20577392440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46766823 (or 46766819 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20577392440 in words is "twenty billion, five hundred seventy-seven million, three hundred ninety-two thousand, four hundred forty".