20544666634 has 16 divisors (see below), whose sum is σ = 32632475400. Its totient is φ = 9667275264.

The previous prime is 20544666631. The next prime is 20544666647. The reversal of 20544666634 is 43666644502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18391428225 + 2153238409 = 135615^2 + 46403^2 .

It is not an unprimeable number, because it can be changed into a prime (20544666631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665902 + ... + 696070.

Almost surely, 2^20544666634 is an apocalyptic number.

20544666634 is a deficient number, since it is larger than the sum of its proper divisors (12087808766).

20544666634 is a wasteful number, since it uses less digits than its factorization.

20544666634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50217.

The product of its (nonzero) digits is 2488320, while the sum is 46.

The spelling of 20544666634 in words is "twenty billion, five hundred forty-four million, six hundred sixty-six thousand, six hundred thirty-four".