20431869389 has 4 divisors (see below), whose sum is σ = 20778172320. Its totient is φ = 20085566460.

The previous prime is 20431869377. The next prime is 20431869401. The reversal of 20431869389 is 98396813402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20431869377) and next prime (20431869401).

It is a cyclic number.

It is not a de Polignac number, because 20431869389 - 2¹⁶ = 20431803853 is a prime.

It is a super-2 number, since 2×20431869389² (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 20431869389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431869349) 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, 173151377 + ... + 173151494.

It is an arithmetic number, because the mean of its divisors is an integer number (5194543080).

Almost surely, 2^20431869389 is an apocalyptic number.

It is an amenable number.

20431869389 is a deficient number, since it is larger than the sum of its proper divisors (346302931).

20431869389 is an equidigital number, since it uses as much as digits as its factorization.

20431869389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346302930.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 20431869389 in words is "twenty billion, four hundred thirty-one million, eight hundred sixty-nine thousand, three hundred eighty-nine".