20646065160 has 256 divisors, whose sum is σ = 79389849600. Its totient is φ = 4674813696.

The previous prime is 20646065101. The next prime is 20646065173. The reversal of 20646065160 is 6156064602.

It is a happy number.

20646065160 is a `hidden beast` number, since 2 + 0 + 646 + 0 + 6 + 5 + 1 + 6 + 0 = 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 63 ways as a sum of consecutive naturals, for example, 796159 + ... + 821681.

It is an arithmetic number, because the mean of its divisors is an integer number (310116600).

Almost surely, 2^20646065160 is an apocalyptic number.

20646065160 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 20646065160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39694924800).

20646065160 is an abundant number, since it is smaller than the sum of its proper divisors (58743784440).

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

20646065160 is a wasteful number, since it uses less digits than its factorization.

20646065160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25657 (or 25647 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20646065160 in words is "twenty billion, six hundred forty-six million, sixty-five thousand, one hundred sixty".