20297560 has 32 divisors (see below), whose sum is σ = 47145600. Its totient is φ = 7856640.

The previous prime is 20297539. The next prime is 20297587. The reversal of 20297560 is 6579202.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 6945 + ... + 9424.

It is an arithmetic number, because the mean of its divisors is an integer number (1473300).

Almost surely, 2^20297560 is an apocalyptic number.

20297560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20297560 is an abundant number, since it is smaller than the sum of its proper divisors (26848040).

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

20297560 is a wasteful number, since it uses less digits than its factorization.

20297560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16411 (or 16407 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20297560 is about 4505.2813452658. The cubic root of 20297560 is about 272.7813103698.

The spelling of 20297560 in words is "twenty million, two hundred ninety-seven thousand, five hundred sixty".