20318683431 has 32 divisors (see below), whose sum is σ = 28461162496. Its totient is φ = 12890469600.

The previous prime is 20318683423. The next prime is 20318683439. The reversal of 20318683431 is 13438681302.

It is an interprime number because it is at equal distance from previous prime (20318683423) and next prime (20318683439).

It is not a de Polignac number, because 20318683431 - 2³ = 20318683423 is a prime.

It is a super-2 number, since 2×20318683431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20318683431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318683439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5449890 + ... + 5453616.

It is an arithmetic number, because the mean of its divisors is an integer number (889411328).

Almost surely, 2^20318683431 is an apocalyptic number.

20318683431 is a deficient number, since it is larger than the sum of its proper divisors (8142479065).

20318683431 is an frugal number, since it uses more digits than its factorization.

20318683431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 20318683431 in words is "twenty billion, three hundred eighteen million, six hundred eighty-three thousand, four hundred thirty-one".