20964558580 has 96 divisors (see below), whose sum is σ = 53085634560. Its totient is φ = 6793787520.

The previous prime is 20964558557. The next prime is 20964558607. The reversal of 20964558580 is 8585546902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169485 + ... + 1187275.

It is an arithmetic number, because the mean of its divisors is an integer number (552975360).

Almost surely, 2^20964558580 is an apocalyptic number.

20964558580 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 20964558580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26542817280).

20964558580 is an abundant number, since it is smaller than the sum of its proper divisors (32121075980).

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

20964558580 is a wasteful number, since it uses less digits than its factorization.

20964558580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18269 (or 18267 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 52.

The spelling of 20964558580 in words is "twenty billion, nine hundred sixty-four million, five hundred fifty-eight thousand, five hundred eighty".