20880920 has 32 divisors (see below), whose sum is σ = 47632320. Its totient is φ = 8236800.

The previous prime is 20880911. The next prime is 20880953. The reversal of 20880920 is 2908802.

It is a congruent number.

It is an unprimeable number.

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, 656 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (1488510).

Almost surely, 2^20880920 is an apocalyptic number.

20880920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20880920 is an abundant number, since it is smaller than the sum of its proper divisors (26751400).

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

20880920 is a wasteful number, since it uses less digits than its factorization.

20880920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7235 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20880920 is about 4569.5645306747. The cubic root of 20880920 is about 275.3699483785.

The spelling of 20880920 in words is "twenty million, eight hundred eighty thousand, nine hundred twenty".