20396320560 has 480 divisors, whose sum is σ = 89158579200. Its totient is φ = 4237954560.

The previous prime is 20396320517. The next prime is 20396320577. The reversal of 20396320560 is 6502369302.

20396320560 is a `hidden beast` number, since 2 + 0 + 3 + 96 + 3 + 2 + 0 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1155481 + ... + 1172999.

It is an arithmetic number, because the mean of its divisors is an integer number (185747040).

Almost surely, 2^20396320560 is an apocalyptic number.

20396320560 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 20396320560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44579289600).

20396320560 is an abundant number, since it is smaller than the sum of its proper divisors (68762258640).

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

20396320560 is a wasteful number, since it uses less digits than its factorization.

20396320560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17566 (or 17547 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

Adding to 20396320560 its reverse (6502369302), we get a palindrome (26898689862).

The spelling of 20396320560 in words is "twenty billion, three hundred ninety-six million, three hundred twenty thousand, five hundred sixty".