20644706530 has 16 divisors (see below), whose sum is σ = 42469110720. Its totient is φ = 7078185072.

The previous prime is 20644706503. The next prime is 20644706531. The reversal of 20644706530 is 3560744602.

It is a self number, because there is not a number n which added to its sum of digits gives 20644706530.

It is not an unprimeable number, because it can be changed into a prime (20644706531) 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, 147462120 + ... + 147462259.

It is an arithmetic number, because the mean of its divisors is an integer number (2654319420).

Almost surely, 2^20644706530 is an apocalyptic number.

20644706530 is an abundant number, since it is smaller than the sum of its proper divisors (21824404190).

20644706530 is a wasteful number, since it uses less digits than its factorization.

20644706530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294924393.

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 20644706530 in words is "twenty billion, six hundred forty-four million, seven hundred six thousand, five hundred thirty".