20597920 has 96 divisors (see below), whose sum is σ = 56827008. Its totient is φ = 6908928.

The previous prime is 20597887. The next prime is 20597933. The reversal of 20597920 is 2979502.

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, 59187 + ... + 59533.

It is an arithmetic number, because the mean of its divisors is an integer number (591948).

Almost surely, 2^20597920 is an apocalyptic number.

20597920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20597920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28413504).

20597920 is an abundant number, since it is smaller than the sum of its proper divisors (36229088).

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

20597920 is a wasteful number, since it uses less digits than its factorization.

20597920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20597920 is about 4538.4931420021. The cubic root of 20597920 is about 274.1202519744.

The spelling of 20597920 in words is "twenty million, five hundred ninety-seven thousand, nine hundred twenty".