20371774431 has 4 divisors (see below), whose sum is σ = 27162365912. Its totient is φ = 13581182952.

The previous prime is 20371774411. The next prime is 20371774447. The reversal of 20371774431 is 13447717302.

It is a happy number.

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

It is not a de Polignac number, because 20371774431 - 2¹¹ = 20371772383 is a prime.

It is a super-2 number, since 2×20371774431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20371774431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20371774411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395295736 + ... + 3395295741.

It is an arithmetic number, because the mean of its divisors is an integer number (6790591478).

Almost surely, 2^20371774431 is an apocalyptic number.

20371774431 is a deficient number, since it is larger than the sum of its proper divisors (6790591481).

20371774431 is an equidigital number, since it uses as much as digits as its factorization.

20371774431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790591480.

The product of its (nonzero) digits is 98784, while the sum is 39.

The spelling of 20371774431 in words is "twenty billion, three hundred seventy-one million, seven hundred seventy-four thousand, four hundred thirty-one".