20130131 has 6 divisors (see below), whose sum is σ = 23416740. Its totient is φ = 17254356.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130131 is 13103102.

It is not a de Polignac number, because 20130131 - 2¹⁴ = 20113747 is a prime.

It is a super-2 number, since 2×20130131² = 810444348154322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20130931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205361 + ... + 205458.

It is an arithmetic number, because the mean of its divisors is an integer number (3902790).

Almost surely, 2^20130131 is an apocalyptic number.

20130131 is a deficient number, since it is larger than the sum of its proper divisors (3286609).

20130131 is an equidigital number, since it uses as much as digits as its factorization.

20130131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410833 (or 410826 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20130131 is about 4486.6614536869. The cubic root of 20130131 is about 272.0292058821.

Adding to 20130131 its reverse (13103102), we get a palindrome (33233233).

The spelling of 20130131 in words is "twenty million, one hundred thirty thousand, one hundred thirty-one".