20397556080 has 960 divisors, whose sum is σ = 85170548736. Its totient is φ = 4478976000.

The previous prime is 20397556079. The next prime is 20397556093. The reversal of 20397556080 is 8065579302.

It is a happy number.

20397556080 is a `hidden beast` number, since 2 + 0 + 3 + 9 + 7 + 5 + 560 + 80 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 112693590 + ... + 112693770.

Almost surely, 2^20397556080 is an apocalyptic number.

20397556080 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 20397556080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42585274368).

20397556080 is an abundant number, since it is smaller than the sum of its proper divisors (64772992656).

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

20397556080 is a wasteful number, since it uses less digits than its factorization.

20397556080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 20397556080 in words is "twenty billion, three hundred ninety-seven million, five hundred fifty-six thousand, eighty".