20023431 has 8 divisors (see below), whose sum is σ = 26737920. Its totient is φ = 13328952.

The previous prime is 20023429. The next prime is 20023441. The reversal of 20023431 is 13432002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20023431 - 2¹ = 20023429 is a prime.

It is a super-2 number, since 2×20023431² = 801875578023522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20023431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (3342240).

Almost surely, 2^20023431 is an apocalyptic number.

20023431 is a deficient number, since it is larger than the sum of its proper divisors (6714489).

20023431 is an equidigital number, since it uses as much as digits as its factorization.

20023431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20023431 is about 4474.7548536205. The cubic root of 20023431 is about 271.5477228226.

Adding to 20023431 its reverse (13432002), we get a palindrome (33455433).

The spelling of 20023431 in words is "twenty million, twenty-three thousand, four hundred thirty-one".