20949889202560 has 128 divisors (see below), whose sum is σ = 53928212205600. Its totient is φ = 7753338617856.

The previous prime is 20949889202521. The next prime is 20949889202609. The reversal of 20949889202560 is 6520298894902.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 20949889202492 and 20949889202501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15676227 + ... + 16960066.

Almost surely, 2^{20949889202560} is an apocalyptic number.

20949889202560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20949889202560 is an abundant number, since it is smaller than the sum of its proper divisors (32978323003040).

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

20949889202560 is a wasteful number, since it uses less digits than its factorization.

20949889202560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32636388 (or 32636376 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 20949889202560 in words is "twenty trillion, nine hundred forty-nine billion, eight hundred eighty-nine million, two hundred two thousand, five hundred sixty".