20576977920 has 132 divisors (see below), whose sum is σ = 71298852300. Its totient is φ = 5487181824.

The previous prime is 20576977919. The next prime is 20576977931. The reversal of 20576977920 is 2977967502.

It can be written as a sum of positive squares in 2 ways, for example, as 3929785344 + 16647192576 = 62688^2 + 129024^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177195 + ... + 269354.

Almost surely, 2^20576977920 is an apocalyptic number.

20576977920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20576977920 is an abundant number, since it is smaller than the sum of its proper divisors (50721874380).

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

20576977920 is a wasteful number, since it uses less digits than its factorization.

20576977920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446580 (or 446559 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The spelling of 20576977920 in words is "twenty billion, five hundred seventy-six million, nine hundred seventy-seven thousand, nine hundred twenty".