20920910 has 16 divisors (see below), whose sum is σ = 38676096. Its totient is φ = 8142048.

The previous prime is 20920909. The next prime is 20920927. The reversal of 20920910 is 1902902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27902 + ... + 28641.

It is an arithmetic number, because the mean of its divisors is an integer number (2417256).

Almost surely, 2^20920910 is an apocalyptic number.

20920910 is a deficient number, since it is larger than the sum of its proper divisors (17755186).

20920910 is a wasteful number, since it uses less digits than its factorization.

20920910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56587.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 20920910 is about 4573.9381281342. The cubic root of 20920910 is about 275.5456274485.

The spelling of 20920910 in words is "twenty million, nine hundred twenty thousand, nine hundred ten".