20920584 has 32 divisors (see below), whose sum is σ = 53291520. Its totient is φ = 6841536.

The previous prime is 20920541. The next prime is 20920589. The reversal of 20920584 is 48502902.

It is not an unprimeable number, because it can be changed into a prime (20920589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6952 + ... + 9495.

It is an arithmetic number, because the mean of its divisors is an integer number (1665360).

Almost surely, 2^20920584 is an apocalyptic number.

20920584 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20920584 is an abundant number, since it is smaller than the sum of its proper divisors (32370936).

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

20920584 is a wasteful number, since it uses less digits than its factorization.

20920584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16509 (or 16505 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20920584 is about 4573.9024913087. The cubic root of 20920584 is about 275.5441962115.

The spelling of 20920584 in words is "twenty million, nine hundred twenty thousand, five hundred eighty-four".