20157387 has 8 divisors (see below), whose sum is σ = 27048336. Its totient is φ = 13352352.

The previous prime is 20157383. The next prime is 20157391. The reversal of 20157387 is 78375102.

It is an interprime number because it is at equal distance from previous prime (20157383) and next prime (20157391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20157387 - 2² = 20157383 is a prime.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20928 + ... + 21869.

It is an arithmetic number, because the mean of its divisors is an integer number (3381042).

Almost surely, 2^20157387 is an apocalyptic number.

20157387 is a deficient number, since it is larger than the sum of its proper divisors (6890949).

20157387 is a wasteful number, since it uses less digits than its factorization.

20157387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42957.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 20157387 is about 4489.6978740223. The cubic root of 20157387 is about 272.1519254709.

The spelling of 20157387 in words is "twenty million, one hundred fifty-seven thousand, three hundred eighty-seven".