20423212131 has 8 divisors (see below), whose sum is σ = 31121085184. Its totient is φ = 11670406920.

The previous prime is 20423212109. The next prime is 20423212217. The reversal of 20423212131 is 13121232402.

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

It is not a de Polignac number, because 20423212131 - 2⁶ = 20423212067 is a prime.

It is a super-2 number, since 2×20423212131² (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), and also a Moran number because the ratio is a prime number: 972533911 = 20423212131 / (2 + 0 + 4 + 2 + 3 + 2 + 1 + 2 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 20423212098 and 20423212107.

It is not an unprimeable number, because it can be changed into a prime (20423210131) 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, 486266935 + ... + 486266976.

It is an arithmetic number, because the mean of its divisors is an integer number (3890135648).

Almost surely, 2^20423212131 is an apocalyptic number.

20423212131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20423212131 is a deficient number, since it is larger than the sum of its proper divisors (10697873053).

20423212131 is an equidigital number, since it uses as much as digits as its factorization.

20423212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972533921.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20423212131 its reverse (13121232402), we get a palindrome (33544444533).

The spelling of 20423212131 in words is "twenty billion, four hundred twenty-three million, two hundred twelve thousand, one hundred thirty-one".