20996765920 has 192 divisors, whose sum is σ = 55389882240. Its totient is φ = 7470931968.

The previous prime is 20996765891. The next prime is 20996765921. The reversal of 20996765920 is 2956769902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996765921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8387389 + ... + 8389891.

It is an arithmetic number, because the mean of its divisors is an integer number (288488970).

Almost surely, 2^20996765920 is an apocalyptic number.

20996765920 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 20996765920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27694941120).

20996765920 is an abundant number, since it is smaller than the sum of its proper divisors (34393116320).

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

20996765920 is a wasteful number, since it uses less digits than its factorization.

20996765920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677 (or 2669 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 20996765920 in words is "twenty billion, nine hundred ninety-six million, seven hundred sixty-five thousand, nine hundred twenty".