20557107 has 24 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 12903408.

The previous prime is 20557099. The next prime is 20557129. The reversal of 20557107 is 70175502.

20557107 is a `hidden beast` number, since 2 + 0 + 557 + 107 = 666.

It is not a de Polignac number, because 20557107 - 2³ = 20557099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40618 + ... + 41120.

It is an arithmetic number, because the mean of its divisors is an integer number (1310400).

Almost surely, 2^20557107 is an apocalyptic number.

20557107 is a deficient number, since it is larger than the sum of its proper divisors (10892493).

20557107 is a wasteful number, since it uses less digits than its factorization.

20557107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 20557107 is about 4533.9945963797. The cubic root of 20557107 is about 273.9390837283.

The spelling of 20557107 in words is "twenty million, five hundred fifty-seven thousand, one hundred seven".