20157238 has 8 divisors (see below), whose sum is σ = 30328200. Its totient is φ = 10047840.

The previous prime is 20157229. The next prime is 20157253. The reversal of 20157238 is 83275102.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 14563 + ... + 15886.

It is an arithmetic number, because the mean of its divisors is an integer number (3791025).

Almost surely, 2^20157238 is an apocalyptic number.

20157238 is a deficient number, since it is larger than the sum of its proper divisors (10170962).

20157238 is a wasteful number, since it uses less digits than its factorization.

20157238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30782.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20157238 is about 4489.6812804474. The cubic root of 20157238 is about 272.1512549022.

The spelling of 20157238 in words is "twenty million, one hundred fifty-seven thousand, two hundred thirty-eight".