20516205670660 has 48 divisors (see below), whose sum is σ = 50439842248320. Its totient is φ = 6862563567360.

The previous prime is 20516205670651. The next prime is 20516205670663. The reversal of 20516205670660 is 6607650261502.

It is a self number, because there is not a number n which added to its sum of digits gives 20516205670660.

It is not an unprimeable number, because it can be changed into a prime (20516205670663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1787120190 + ... + 1787131669.

It is an arithmetic number, because the mean of its divisors is an integer number (1050830046840).

Almost surely, 2^{20516205670660} is an apocalyptic number.

20516205670660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20516205670660 is an abundant number, since it is smaller than the sum of its proper divisors (29923636577660).

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

20516205670660 is a wasteful number, since it uses less digits than its factorization.

20516205670660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574251916 (or 3574251914 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 20516205670660 in words is "twenty trillion, five hundred sixteen billion, two hundred five million, six hundred seventy thousand, six hundred sixty".