20157842 has 16 divisors (see below), whose sum is σ = 31397760. Its totient is φ = 9694608.

The previous prime is 20157833. The next prime is 20157889. The reversal of 20157842 is 24875102.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20813 + ... + 21759.

It is an arithmetic number, because the mean of its divisors is an integer number (1962360).

Almost surely, 2^20157842 is an apocalyptic number.

20157842 is a deficient number, since it is larger than the sum of its proper divisors (11239918).

20157842 is a wasteful number, since it uses less digits than its factorization.

20157842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20157842 is about 4489.7485452974. The cubic root of 20157842 is about 272.1539731601.

The spelling of 20157842 in words is "twenty million, one hundred fifty-seven thousand, eight hundred forty-two".