20157942 has 16 divisors (see below), whose sum is σ = 46075392. Its totient is φ = 5759400.

The previous prime is 20157941. The next prime is 20157947. The reversal of 20157942 is 24975102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157941) 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, 239934 + ... + 240017.

It is an arithmetic number, because the mean of its divisors is an integer number (2879712).

Almost surely, 2^20157942 is an apocalyptic number.

20157942 is an abundant number, since it is smaller than the sum of its proper divisors (25917450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20157942 is a wasteful number, since it uses less digits than its factorization.

20157942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479963.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20157942 is about 4489.7596817647. The cubic root of 20157942 is about 272.1544231976.

The spelling of 20157942 in words is "twenty million, one hundred fifty-seven thousand, nine hundred forty-two".