20520898560 has 832 divisors, whose sum is σ = 80678073600. Its totient is φ = 4926210048.

The previous prime is 20520898549. The next prime is 20520898579. The reversal of 20520898560 is 6589802502.

20520898560 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 0 + 89 + 8 + 560 = 666.

It is a super-2 number, since 2×20520898560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 347811811 + ... + 347811869.

Almost surely, 2^20520898560 is an apocalyptic number.

20520898560 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 20520898560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40339036800).

20520898560 is an abundant number, since it is smaller than the sum of its proper divisors (60157175040).

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

20520898560 is a wasteful number, since it uses less digits than its factorization.

20520898560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 20520898560 in words is "twenty billion, five hundred twenty million, eight hundred ninety-eight thousand, five hundred sixty".