20131392 has 28 divisors (see below), whose sum is σ = 53264816. Its totient is φ = 6710400.

The previous prime is 20131387. The next prime is 20131399. The reversal of 20131392 is 29313102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20131399) 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, 52234 + ... + 52617.

Almost surely, 2^20131392 is an apocalyptic number.

It is an amenable number.

20131392 is an abundant number, since it is smaller than the sum of its proper divisors (33133424).

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

20131392 is a wasteful number, since it uses less digits than its factorization.

20131392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104866 (or 104856 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20131392 is about 4486.8019791384. The cubic root of 20131392 is about 272.0348859522.

Adding to 20131392 its reverse (29313102), we get a palindrome (49444494).

The spelling of 20131392 in words is "twenty million, one hundred thirty-one thousand, three hundred ninety-two".