20297156 has 12 divisors (see below), whose sum is σ = 38749200. Its totient is φ = 9225960.

The previous prime is 20297143. The next prime is 20297177. The reversal of 20297156 is 65179202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230606 + ... + 230693.

It is an arithmetic number, because the mean of its divisors is an integer number (3229100).

Almost surely, 2^20297156 is an apocalyptic number.

It is an amenable number.

20297156 is a deficient number, since it is larger than the sum of its proper divisors (18452044).

20297156 is a wasteful number, since it uses less digits than its factorization.

20297156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461314 (or 461312 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20297156 is about 4505.2365087751. The cubic root of 20297156 is about 272.7795005565.

The spelling of 20297156 in words is "twenty million, two hundred ninety-seven thousand, one hundred fifty-six".