20131357 has 4 divisors (see below), whose sum is σ = 20159776. Its totient is φ = 20102940.

The previous prime is 20131339. The next prime is 20131373. The reversal of 20131357 is 75313102.

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.

It is a cyclic number.

It is not a de Polignac number, because 20131357 - 2⁷ = 20131229 is a prime.

It is a super-2 number, since 2×20131357² = 810543069322898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131387) by changing a digit.

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, 13119 + ... + 14572.

It is an arithmetic number, because the mean of its divisors is an integer number (5039944).

Almost surely, 2^20131357 is an apocalyptic number.

It is an amenable number.

20131357 is a deficient number, since it is larger than the sum of its proper divisors (28419).

20131357 is an equidigital number, since it uses as much as digits as its factorization.

20131357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28418.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20131357 is about 4486.7980788085. The cubic root of 20131357 is about 272.0347283008.

Adding to 20131357 its reverse (75313102), we get a palindrome (95444459).

The spelling of 20131357 in words is "twenty million, one hundred thirty-one thousand, three hundred fifty-seven".