20654502664 has 8 divisors (see below), whose sum is σ = 38727192510. Its totient is φ = 10327251328.

The previous prime is 20654502611. The next prime is 20654502683. The reversal of 20654502664 is 46620545602.

It can be written as a sum of positive squares in only one way, i.e., 20375278564 + 279224100 = 142742^2 + 16710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290906409 + ... + 1290906424.

Almost surely, 2^20654502664 is an apocalyptic number.

It is an amenable number.

20654502664 is a deficient number, since it is larger than the sum of its proper divisors (18072689846).

20654502664 is a wasteful number, since it uses less digits than its factorization.

20654502664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581812839 (or 2581812835 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 20654502664 in words is "twenty billion, six hundred fifty-four million, five hundred two thousand, six hundred sixty-four".