20709880560 has 60 divisors (see below), whose sum is σ = 69550684632. Its totient is φ = 5522634624.

The previous prime is 20709880523. The next prime is 20709880561. The reversal of 20709880560 is 6508890702.

20709880560 is a `hidden beast` number, since 2 + 0 + 7 + 0 + 9 + 8 + 80 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709880561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14381142 + ... + 14382581.

Almost surely, 2^20709880560 is an apocalyptic number.

20709880560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20709880560 is an abundant number, since it is smaller than the sum of its proper divisors (48840804072).

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

20709880560 is a wasteful number, since it uses less digits than its factorization.

20709880560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28763742 (or 28763733 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 20709880560 in words is "twenty billion, seven hundred nine million, eight hundred eighty thousand, five hundred sixty".