20980666730 has 16 divisors (see below), whose sum is σ = 37826818344. Its totient is φ = 8378573760.

The previous prime is 20980666727. The next prime is 20980666757. The reversal of 20980666730 is 3766608902.

It can be written as a sum of positive squares in 4 ways, for example, as 17157594169 + 3823072561 = 130987^2 + 61831^2 .

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, 1705181 + ... + 1717440.

Almost surely, 2^20980666730 is an apocalyptic number.

20980666730 is a deficient number, since it is larger than the sum of its proper divisors (16846151614).

20980666730 is a wasteful number, since it uses less digits than its factorization.

20980666730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423241.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 20980666730 in words is "twenty billion, nine hundred eighty million, six hundred sixty-six thousand, seven hundred thirty".