20123131 has 4 divisors (see below), whose sum is σ = 22997872. Its totient is φ = 17248392.

The previous prime is 20123119. The next prime is 20123141. The reversal of 20123131 is 13132102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20123131 - 2⁵ = 20123099 is a prime.

It is a super-2 number, since 2×20123131² = 809880802486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123141) 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, 1437360 + ... + 1437373.

It is an arithmetic number, because the mean of its divisors is an integer number (5749468).

Almost surely, 2^20123131 is an apocalyptic number.

20123131 is a deficient number, since it is larger than the sum of its proper divisors (2874741).

20123131 is an equidigital number, since it uses as much as digits as its factorization.

20123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874740.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20123131 is about 4485.8812957991. The cubic root of 20123131 is about 271.9976706476.

Adding to 20123131 its reverse (13132102), we get a palindrome (33255233).

It can be divided in two parts, 201 and 23131, that added together give a palindrome (23332).

The spelling of 20123131 in words is "twenty million, one hundred twenty-three thousand, one hundred thirty-one".