20513471660 has 24 divisors (see below), whose sum is σ = 46994499216. Its totient is φ = 7459444160.

The previous prime is 20513471659. The next prime is 20513471669. The reversal of 20513471660 is 6617431502.

It is a self number, because there is not a number n which added to its sum of digits gives 20513471660.

It is not an unprimeable number, because it can be changed into a prime (20513471669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46621307 + ... + 46621746.

It is an arithmetic number, because the mean of its divisors is an integer number (1958104134).

Almost surely, 2^20513471660 is an apocalyptic number.

20513471660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513471660 is an abundant number, since it is smaller than the sum of its proper divisors (26481027556).

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

20513471660 is a wasteful number, since it uses less digits than its factorization.

20513471660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93243073 (or 93243071 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 20513471660 in words is "twenty billion, five hundred thirteen million, four hundred seventy-one thousand, six hundred sixty".