20920570 has 32 divisors (see below), whose sum is σ = 42871680. Its totient is φ = 7275840.

The previous prime is 20920541. The next prime is 20920589. The reversal of 20920570 is 7502902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1605 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (1339740).

Almost surely, 2^20920570 is an apocalyptic number.

20920570 is an abundant number, since it is smaller than the sum of its proper divisors (21951110).

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

20920570 is a wasteful number, since it uses less digits than its factorization.

20920570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8310.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20920570 is about 4573.9009608867. The cubic root of 20920570 is about 275.5441347470.

The spelling of 20920570 in words is "twenty million, nine hundred twenty thousand, five hundred seventy".