20644516644546 has 16 divisors (see below), whose sum is σ = 41355952313184. Its totient is φ = 6870352377504.

The previous prime is 20644516644503. The next prime is 20644516644617. The reversal of 20644516644546 is 64544661544602.

It is a super-2 number, since 2×20644516644546² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2788288660 + ... + 2788296063.

It is an arithmetic number, because the mean of its divisors is an integer number (2584747019574).

Almost surely, 2^{20644516644546} is an apocalyptic number.

20644516644546 is an abundant number, since it is smaller than the sum of its proper divisors (20711435668638).

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

20644516644546 is a wasteful number, since it uses less digits than its factorization.

20644516644546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5576585345.

The product of its (nonzero) digits is 66355200, while the sum is 57.

The spelling of 20644516644546 in words is "twenty trillion, six hundred forty-four billion, five hundred sixteen million, six hundred forty-four thousand, five hundred forty-six".