20402232031 has 2 divisors, whose sum is σ = 20402232032. Its totient is φ = 20402232030.

The previous prime is 20402232023. The next prime is 20402232143. The reversal of 20402232031 is 13023220402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20402232031 - 2³ = 20402232023 is a prime.

It is a super-2 number, since 2×20402232031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402232001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201116015 + 10201116016.

It is an arithmetic number, because the mean of its divisors is an integer number (10201116016).

Almost surely, 2^20402232031 is an apocalyptic number.

20402232031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402232031 is an equidigital number, since it uses as much as digits as its factorization.

20402232031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20402232031 its reverse (13023220402), we get a palindrome (33425452433).

The spelling of 20402232031 in words is "twenty billion, four hundred two million, two hundred thirty-two thousand, thirty-one".