20691318375 has 320 divisors, whose sum is σ = 50307409152. Its totient is φ = 8211456000.

The previous prime is 20691318367. The next prime is 20691318407. The reversal of 20691318375 is 57381319602.

It is not a de Polignac number, because 20691318375 - 2³ = 20691318367 is a prime.

It is a super-2 number, since 2×20691318375² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20691318375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 15662715 + ... + 15664035.

Almost surely, 2^20691318375 is an apocalyptic number.

20691318375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20691318375 is an abundant number, since it is smaller than the sum of its proper divisors (29616090777).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20691318375 is a wasteful number, since it uses less digits than its factorization.

20691318375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 20691318375 in words is "twenty billion, six hundred ninety-one million, three hundred eighteen thousand, three hundred seventy-five".