20687692896 has 360 divisors, whose sum is σ = 66793030920. Its totient is φ = 6277699584.

The previous prime is 20687692889. The next prime is 20687692903. The reversal of 20687692896 is 69829678602.

It is an interprime number because it is at equal distance from previous prime (20687692889) and next prime (20687692903).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 36357700 + ... + 36358268.

It is an arithmetic number, because the mean of its divisors is an integer number (185536197).

Almost surely, 2^20687692896 is an apocalyptic number.

20687692896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20687692896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33396515460).

20687692896 is an abundant number, since it is smaller than the sum of its proper divisors (46105338024).

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

20687692896 is a wasteful number, since it uses less digits than its factorization.

20687692896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 20687692896 in words is "twenty billion, six hundred eighty-seven million, six hundred ninety-two thousand, eight hundred ninety-six".