20431402031 has 16 divisors (see below), whose sum is σ = 21706924800. Its totient is φ = 19176393600.

The previous prime is 20431402027. The next prime is 20431402063. The reversal of 20431402031 is 13020413402.

It is a cyclic number.

It is not a de Polignac number, because 20431402031 - 2² = 20431402027 is a prime.

It is a super-2 number, since 2×20431402031² (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 = 20431401994 and 20431402012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431402231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1564055 + ... + 1577063.

It is an arithmetic number, because the mean of its divisors is an integer number (1356682800).

Almost surely, 2^20431402031 is an apocalyptic number.

20431402031 is a deficient number, since it is larger than the sum of its proper divisors (1275522769).

20431402031 is a wasteful number, since it uses less digits than its factorization.

20431402031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13790.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20431402031 its reverse (13020413402), we get a palindrome (33451815433).

The spelling of 20431402031 in words is "twenty billion, four hundred thirty-one million, four hundred two thousand, thirty-one".