20920620 has 48 divisors (see below), whose sum is σ = 66947328. Its totient is φ = 4781760.

The previous prime is 20920589. The next prime is 20920631. The reversal of 20920620 is 2602902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 24486 + ... + 25325.

It is an arithmetic number, because the mean of its divisors is an integer number (1394736).

Almost surely, 2^20920620 is an apocalyptic number.

20920620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20920620 is an abundant number, since it is smaller than the sum of its proper divisors (46026708).

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

20920620 is a wasteful number, since it uses less digits than its factorization.

20920620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49830 (or 49828 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20920620 is about 4573.9064266773. The cubic root of 20920620 is about 275.5443542629.

The spelling of 20920620 in words is "twenty million, nine hundred twenty thousand, six hundred twenty".