20238157 has 4 divisors (see below), whose sum is σ = 20249856. Its totient is φ = 20226460.

The previous prime is 20238151. The next prime is 20238191. The reversal of 20238157 is 75183202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20238157 - 2¹⁵ = 20205389 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 (20238151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2683 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (5062464).

Almost surely, 2^20238157 is an apocalyptic number.

It is an amenable number.

20238157 is a deficient number, since it is larger than the sum of its proper divisors (11699).

20238157 is an equidigital number, since it uses as much as digits as its factorization.

20238157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11698.

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

The square root of 20238157 is about 4498.6839186589. The cubic root of 20238157 is about 272.5149423672.

The spelling of 20238157 in words is "twenty million, two hundred thirty-eight thousand, one hundred fifty-seven".