20013663505450 has 48 divisors (see below), whose sum is σ = 39416255870040. Its totient is φ = 7534343198720.

The previous prime is 20013663505421. The next prime is 20013663505483. The reversal of 20013663505450 is 5450536631002.

It can be written as a sum of positive squares in 12 ways, for example, as 272961316849 + 19740702188601 = 522457^2 + 4443051^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31637454 + ... + 32263846.

Almost surely, 2^{20013663505450} is an apocalyptic number.

20013663505450 is a deficient number, since it is larger than the sum of its proper divisors (19402592364590).

20013663505450 is a wasteful number, since it uses less digits than its factorization.

20013663505450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664011 (or 664006 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 20013663505450 in words is "twenty trillion, thirteen billion, six hundred sixty-three million, five hundred five thousand, four hundred fifty".