20351132431 has 4 divisors (see below), whose sum is σ = 23258437072. Its totient is φ = 17443827792.

The previous prime is 20351132419. The next prime is 20351132437. The reversal of 20351132431 is 13423115302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20351132431 - 2⁷ = 20351132303 is a prime.

It is a super-2 number, since 2×20351132431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20351132396 and 20351132405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351132437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453652310 + ... + 1453652323.

It is an arithmetic number, because the mean of its divisors is an integer number (5814609268).

Almost surely, 2^20351132431 is an apocalyptic number.

20351132431 is a deficient number, since it is larger than the sum of its proper divisors (2907304641).

20351132431 is an equidigital number, since it uses as much as digits as its factorization.

20351132431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907304640.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20351132431 its reverse (13423115302), we get a palindrome (33774247733).

The spelling of 20351132431 in words is "twenty billion, three hundred fifty-one million, one hundred thirty-two thousand, four hundred thirty-one".