20557912 has 8 divisors (see below), whose sum is σ = 38546100. Its totient is φ = 10278952.

The previous prime is 20557909. The next prime is 20557919. The reversal of 20557912 is 21975502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284862 + ... + 1284877.

Almost surely, 2^20557912 is an apocalyptic number.

It is an amenable number.

20557912 is a deficient number, since it is larger than the sum of its proper divisors (17988188).

20557912 is a wasteful number, since it uses less digits than its factorization.

20557912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569745 (or 2569741 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 20557912 is about 4534.0833693262. The cubic root of 20557912 is about 273.9426594273.

The spelling of 20557912 in words is "twenty million, five hundred fifty-seven thousand, nine hundred twelve".