20397056 has 22 divisors (see below), whose sum is σ = 40776240. Its totient is φ = 10198016.

The previous prime is 20397031. The next prime is 20397073. The reversal of 20397056 is 65079302.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8936 + ... + 10983.

Almost surely, 2^20397056 is an apocalyptic number.

It is an amenable number.

20397056 is a deficient number, since it is larger than the sum of its proper divisors (20379184).

20397056 is an equidigital number, since it uses as much as digits as its factorization.

20397056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19939 (or 19921 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20397056 is about 4516.3099982176. The cubic root of 20397056 is about 273.2262969098.

The spelling of 20397056 in words is "twenty million, three hundred ninety-seven thousand, fifty-six".