20920618732 has 24 divisors (see below), whose sum is σ = 39601030896. Its totient is φ = 9613128768.

The previous prime is 20920618721. The next prime is 20920618757. The reversal of 20920618732 is 23781602902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874363 + ... + 897970.

It is an arithmetic number, because the mean of its divisors is an integer number (1650042954).

Almost surely, 2^20920618732 is an apocalyptic number.

It is an amenable number.

20920618732 is a deficient number, since it is larger than the sum of its proper divisors (18680412164).

20920618732 is a wasteful number, since it uses less digits than its factorization.

20920618732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772577 (or 1772575 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20920618732 in words is "twenty billion, nine hundred twenty million, six hundred eighteen thousand, seven hundred thirty-two".