20920872 has 32 divisors (see below), whose sum is σ = 59774400. Its totient is φ = 5977344.

The previous prime is 20920871. The next prime is 20920891. The reversal of 20920872 is 27802902.

It is not an unprimeable number, because it can be changed into a prime (20920871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62097 + ... + 62432.

It is an arithmetic number, because the mean of its divisors is an integer number (1867950).

Almost surely, 2^20920872 is an apocalyptic number.

It is an amenable number.

20920872 is an abundant number, since it is smaller than the sum of its proper divisors (38853528).

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

20920872 is a wasteful number, since it uses less digits than its factorization.

20920872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124545 (or 124541 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20920872 is about 4573.9339741627. The cubic root of 20920872 is about 275.5454606180.

The spelling of 20920872 in words is "twenty million, nine hundred twenty thousand, eight hundred seventy-two".