20402403231 has 32 divisors (see below), whose sum is σ = 31971921408. Its totient is φ = 11329781760.

The previous prime is 20402403223. The next prime is 20402403257. The reversal of 20402403231 is 13230420402.

It is not a de Polignac number, because 20402403231 - 2³ = 20402403223 is a prime.

It is a super-2 number, since 2×20402403231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20402403198 and 20402403207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402403331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175176 + ... + 267378.

It is an arithmetic number, because the mean of its divisors is an integer number (999122544).

Almost surely, 2^20402403231 is an apocalyptic number.

20402403231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20402403231 is a deficient number, since it is larger than the sum of its proper divisors (11569518177).

20402403231 is a wasteful number, since it uses less digits than its factorization.

20402403231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92511.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20402403231 its reverse (13230420402), we get a palindrome (33632823633).

The spelling of 20402403231 in words is "twenty billion, four hundred two million, four hundred three thousand, two hundred thirty-one".