20930920 has 32 divisors (see below), whose sum is σ = 49144320. Its totient is φ = 8008000.

The previous prime is 20930909. The next prime is 20930957. The reversal of 20930920 is 2903902.

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, 10456 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (1535760).

Almost surely, 2^20930920 is an apocalyptic number.

20930920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20930920 is an abundant number, since it is smaller than the sum of its proper divisors (28213400).

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

20930920 is a wasteful number, since it uses less digits than its factorization.

20930920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22785 (or 22781 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20930920 is about 4575.0322403236. The cubic root of 20930920 is about 275.5895670914.

The spelling of 20930920 in words is "twenty million, nine hundred thirty thousand, nine hundred twenty".