20131356 has 96 divisors (see below), whose sum is σ = 56358400. Its totient is φ = 5588352.

The previous prime is 20131339. The next prime is 20131373. The reversal of 20131356 is 65313102.

It is an interprime number because it is at equal distance from previous prime (20131339) and next prime (20131373).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275736 + ... + 275808.

Almost surely, 2^20131356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28179200).

20131356 is an abundant number, since it is smaller than the sum of its proper divisors (36227044).

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

20131356 is a wasteful number, since it uses less digits than its factorization.

20131356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20131356 is about 4486.7979673705. The cubic root of 20131356 is about 272.0347237965.

Adding to 20131356 its reverse (65313102), we get a palindrome (85444458).

The spelling of 20131356 in words is "twenty million, one hundred thirty-one thousand, three hundred fifty-six".