20986498560 has 160 divisors (see below), whose sum is σ = 68192590752. Its totient is φ = 5504532480.

The previous prime is 20986498541. The next prime is 20986498567. The reversal of 20986498560 is 6589468902.

It is a tau number, because it is divible by the number of its divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 20986498560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986498567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446082 + ... + 490878.

Almost surely, 2^20986498560 is an apocalyptic number.

20986498560 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 20986498560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34096295376).

20986498560 is an abundant number, since it is smaller than the sum of its proper divisors (47206092192).

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

20986498560 is an equidigital number, since it uses as much as digits as its factorization.

20986498560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44884 (or 44868 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 20986498560 in words is "twenty billion, nine hundred eighty-six million, four hundred ninety-eight thousand, five hundred sixty".