20332231131 has 4 divisors (see below), whose sum is σ = 27109641512. Its totient is φ = 13554820752.

The previous prime is 20332231111. The next prime is 20332231181. The reversal of 20332231131 is 13113223302.

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

It is not a de Polignac number, because 20332231131 - 2²³ = 20323842523 is a prime.

It is a super-2 number, since 2×20332231131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20332231098 and 20332231107.

It is not an unprimeable number, because it can be changed into a prime (20332231111) 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, 3388705186 + ... + 3388705191.

It is an arithmetic number, because the mean of its divisors is an integer number (6777410378).

Almost surely, 2^20332231131 is an apocalyptic number.

20332231131 is a deficient number, since it is larger than the sum of its proper divisors (6777410381).

20332231131 is an equidigital number, since it uses as much as digits as its factorization.

20332231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777410380.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20332231131 its reverse (13113223302), we get a palindrome (33445454433).

The spelling of 20332231131 in words is "twenty billion, three hundred thirty-two million, two hundred thirty-one thousand, one hundred thirty-one".