20756747018 has 12 divisors (see below), whose sum is σ = 36218405682. Its totient is φ = 8895748680.

The previous prime is 20756747017. The next prime is 20756747059. The reversal of 20756747018 is 81074765702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18424533169 + 2332213849 = 135737^2 + 48293^2 .

It is not an unprimeable number, because it can be changed into a prime (20756747017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105901673 + ... + 105901868.

Almost surely, 2^20756747018 is an apocalyptic number.

20756747018 is a deficient number, since it is larger than the sum of its proper divisors (15461658664).

20756747018 is a wasteful number, since it uses less digits than its factorization.

20756747018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211803557 (or 211803550 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 47.

The spelling of 20756747018 in words is "twenty billion, seven hundred fifty-six million, seven hundred forty-seven thousand, eighteen".