20557196 has 12 divisors (see below), whose sum is σ = 39245640. Its totient is φ = 9344160.

The previous prime is 20557181. The next prime is 20557211. The reversal of 20557196 is 69175502.

It is an interprime number because it is at equal distance from previous prime (20557181) and next prime (20557211).

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, 233561 + ... + 233648.

It is an arithmetic number, because the mean of its divisors is an integer number (3270470).

Almost surely, 2^20557196 is an apocalyptic number.

It is an amenable number.

20557196 is a deficient number, since it is larger than the sum of its proper divisors (18688444).

20557196 is a wasteful number, since it uses less digits than its factorization.

20557196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467224 (or 467222 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 20557196 is about 4534.0044111139. The cubic root of 20557196 is about 273.9394790586.

The spelling of 20557196 in words is "twenty million, five hundred fifty-seven thousand, one hundred ninety-six".