20516615650 has 12 divisors (see below), whose sum is σ = 38160905202. Its totient is φ = 8206646240.

The previous prime is 20516615599. The next prime is 20516615653. The reversal of 20516615650 is 5651661502.

It can be written as a sum of positive squares in 3 ways, for example, as 13604189769 + 6912425881 = 116637^2 + 83141^2 .

It is not an unprimeable number, because it can be changed into a prime (20516615653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205166107 + ... + 205166206.

Almost surely, 2^20516615650 is an apocalyptic number.

20516615650 is a deficient number, since it is larger than the sum of its proper divisors (17644289552).

20516615650 is a wasteful number, since it uses less digits than its factorization.

20516615650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410332325 (or 410332320 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 20516615650 in words is "twenty billion, five hundred sixteen million, six hundred fifteen thousand, six hundred fifty".