20423120431 has 8 divisors (see below), whose sum is σ = 23689078400. Its totient is φ = 17244254808.

The previous prime is 20423120423. The next prime is 20423120477. The reversal of 20423120431 is 13402132402.

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

It is a cyclic number.

It is not a de Polignac number, because 20423120431 - 2³ = 20423120423 is a prime.

It is a super-2 number, since 2×20423120431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423121431) 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, 21772581 + ... + 21773518.

It is an arithmetic number, because the mean of its divisors is an integer number (2961134800).

Almost surely, 2^20423120431 is an apocalyptic number.

20423120431 is a deficient number, since it is larger than the sum of its proper divisors (3265957969).

20423120431 is an equidigital number, since it uses as much as digits as its factorization.

20423120431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43546173.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20423120431 its reverse (13402132402), we get a palindrome (33825252833).

The spelling of 20423120431 in words is "twenty billion, four hundred twenty-three million, one hundred twenty thousand, four hundred thirty-one".