20964809580 has 576 divisors, whose sum is σ = 74917785600. Its totient is φ = 4313548800.

The previous prime is 20964809563. The next prime is 20964809599. The reversal of 20964809580 is 8590846902.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 140703346 + ... + 140703494.

It is an arithmetic number, because the mean of its divisors is an integer number (130065600).

Almost surely, 2^20964809580 is an apocalyptic number.

20964809580 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 20964809580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37458892800).

20964809580 is an abundant number, since it is smaller than the sum of its proper divisors (53952976020).

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

20964809580 is a wasteful number, since it uses less digits than its factorization.

20964809580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 20964809580 in words is "twenty billion, nine hundred sixty-four million, eight hundred nine thousand, five hundred eighty".