20687365360 has 80 divisors (see below), whose sum is σ = 49433487840. Its totient is φ = 8046904320.

The previous prime is 20687365339. The next prime is 20687365411. The reversal of 20687365360 is 6356378602.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 20687365360.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774630 + ... + 800890.

It is an arithmetic number, because the mean of its divisors is an integer number (617918598).

Almost surely, 2^20687365360 is an apocalyptic number.

20687365360 is a gapful number since it is divisible by the number (20) 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 20687365360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24716743920).

20687365360 is an abundant number, since it is smaller than the sum of its proper divisors (28746122480).

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

20687365360 is a wasteful number, since it uses less digits than its factorization.

20687365360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26546 (or 26540 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 20687365360 in words is "twenty billion, six hundred eighty-seven million, three hundred sixty-five thousand, three hundred sixty".