20157388 has 6 divisors (see below), whose sum is σ = 35275436. Its totient is φ = 10078692.

The previous prime is 20157383. The next prime is 20157391. The reversal of 20157388 is 88375102.

It is not an unprimeable number, because it can be changed into a prime (20157383) by changing a digit.

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 as a sum of consecutive naturals, namely, 2519670 + ... + 2519677.

Almost surely, 2^20157388 is an apocalyptic number.

It is an amenable number.

20157388 is a deficient number, since it is larger than the sum of its proper divisors (15118048).

20157388 is a wasteful number, since it uses less digits than its factorization.

20157388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039351 (or 5039349 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 20157388 is about 4489.6979853883. The cubic root of 20157388 is about 272.1519299713.

The spelling of 20157388 in words is "twenty million, one hundred fifty-seven thousand, three hundred eighty-eight".