20861716386 has 48 divisors (see below), whose sum is σ = 48789665280. Its totient is φ = 5929267680.

The previous prime is 20861716303. The next prime is 20861716397. The reversal of 20861716386 is 68361716802.

It is a super-2 number, since 2×20861716386² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129601 + ... + 241908.

It is an arithmetic number, because the mean of its divisors is an integer number (1016451360).

Almost surely, 2^20861716386 is an apocalyptic number.

20861716386 is an abundant number, since it is smaller than the sum of its proper divisors (27927948894).

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

20861716386 is a wasteful number, since it uses less digits than its factorization.

20861716386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371719 (or 371712 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 20861716386 in words is "twenty billion, eight hundred sixty-one million, seven hundred sixteen thousand, three hundred eighty-six".