20942157 has 8 divisors (see below), whose sum is σ = 28124320. Its totient is φ = 13860720.

The previous prime is 20942149. The next prime is 20942183. The reversal of 20942157 is 75124902.

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

It is not a de Polignac number, because 20942157 - 2³ = 20942149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942357) 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, 24694 + ... + 25527.

It is an arithmetic number, because the mean of its divisors is an integer number (3515540).

Almost surely, 2^20942157 is an apocalyptic number.

It is an amenable number.

20942157 is a deficient number, since it is larger than the sum of its proper divisors (7182163).

20942157 is a wasteful number, since it uses less digits than its factorization.

20942157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50363.

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

The square root of 20942157 is about 4576.2601543182. The cubic root of 20942157 is about 275.6388760554.

The spelling of 20942157 in words is "twenty million, nine hundred forty-two thousand, one hundred fifty-seven".