20331423 has 18 divisors (see below), whose sum is σ = 34163064. Its totient is φ = 11617704.

The previous prime is 20331419. The next prime is 20331461. The reversal of 20331423 is 32413302.

It is not a de Polignac number, because 20331423 - 2² = 20331419 is a prime.

It is a super-2 number, since 2×20331423² = 826733522409858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20331396 and 20331405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22611 + ... + 23492.

It is an arithmetic number, because the mean of its divisors is an integer number (1897948).

Almost surely, 2^20331423 is an apocalyptic number.

20331423 is a deficient number, since it is larger than the sum of its proper divisors (13831641).

20331423 is a wasteful number, since it uses less digits than its factorization.

20331423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46123 (or 46113 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20331423 is about 4509.0379239922. The cubic root of 20331423 is about 272.9329223760.

Adding to 20331423 its reverse (32413302), we get a palindrome (52744725).

It can be divided in two parts, 203 and 31423, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 20331423 in words is "twenty million, three hundred thirty-one thousand, four hundred twenty-three".