20975156736 has 160 divisors (see below), whose sum is σ = 57797863200. Its totient is φ = 6754369536.

The previous prime is 20975156731. The next prime is 20975156789. The reversal of 20975156736 is 63765157902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975156731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8466730 + ... + 8469206.

It is an arithmetic number, because the mean of its divisors is an integer number (361236645).

Almost surely, 2^20975156736 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 20975156736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28898931600).

20975156736 is an abundant number, since it is smaller than the sum of its proper divisors (36822706464).

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

20975156736 is a wasteful number, since it uses less digits than its factorization.

20975156736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684 (or 2668 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 20975156736 in words is "twenty billion, nine hundred seventy-five million, one hundred fifty-six thousand, seven hundred thirty-six".