20665246650 has 24 divisors (see below), whose sum is σ = 51249812064. Its totient is φ = 5510732400.

The previous prime is 20665246627. The next prime is 20665246661. The reversal of 20665246650 is 5664256602.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68884006 + ... + 68884305.

It is an arithmetic number, because the mean of its divisors is an integer number (2135408836).

Almost surely, 2^20665246650 is an apocalyptic number.

20665246650 is an abundant number, since it is smaller than the sum of its proper divisors (30584565414).

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

20665246650 is a wasteful number, since it uses less digits than its factorization.

20665246650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137768326 (or 137768321 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 20665246650 in words is "twenty billion, six hundred sixty-five million, two hundred forty-six thousand, six hundred fifty".