20730747188 has 12 divisors (see below), whose sum is σ = 36286663812. Its totient is φ = 10363128960.

The previous prime is 20730747151. The next prime is 20730747197. The reversal of 20730747188 is 88174703702.

It can be written as a sum of positive squares in 2 ways, for example, as 8121253924 + 12609493264 = 90118^2 + 112292^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540293 + ... + 577388.

It is an arithmetic number, because the mean of its divisors is an integer number (3023888651).

Almost surely, 2^20730747188 is an apocalyptic number.

It is an amenable number.

20730747188 is a deficient number, since it is larger than the sum of its proper divisors (15555916624).

20730747188 is a wasteful number, since it uses less digits than its factorization.

20730747188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122322 (or 1122320 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 20730747188 in words is "twenty billion, seven hundred thirty million, seven hundred forty-seven thousand, one hundred eighty-eight".