20686925688 has 192 divisors, whose sum is σ = 61385671200. Its totient is φ = 5770828800.

The previous prime is 20686925647. The next prime is 20686925729. The reversal of 20686925688 is 88652968602.

It is an interprime number because it is at equal distance from previous prime (20686925647) and next prime (20686925729).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24953658 + ... + 24954486.

Almost surely, 2^20686925688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20686925688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30692835600).

20686925688 is an abundant number, since it is smaller than the sum of its proper divisors (40698745512).

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

20686925688 is a wasteful number, since it uses less digits than its factorization.

20686925688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 20686925688 in words is "twenty billion, six hundred eighty-six million, nine hundred twenty-five thousand, six hundred eighty-eight".