20661667160 has 16 divisors (see below), whose sum is σ = 46488751200. Its totient is φ = 8264666848.

The previous prime is 20661667129. The next prime is 20661667217. The reversal of 20661667160 is 6176616602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258270800 + ... + 258270879.

It is an arithmetic number, because the mean of its divisors is an integer number (2905546950).

Almost surely, 2^20661667160 is an apocalyptic number.

20661667160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20661667160 is an abundant number, since it is smaller than the sum of its proper divisors (25827084040).

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

20661667160 is a wasteful number, since it uses less digits than its factorization.

20661667160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516541690 (or 516541686 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 20661667160 in words is "twenty billion, six hundred sixty-one million, six hundred sixty-seven thousand, one hundred sixty".