20747664530 has 32 divisors (see below), whose sum is σ = 38399281200. Its totient is φ = 8065474560.

The previous prime is 20747664439. The next prime is 20747664541. The reversal of 20747664530 is 3546674702.

It can be written as a sum of positive squares in 8 ways, for example, as 6759635089 + 13988029441 = 82217^2 + 118271^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294146 + ... + 357794.

Almost surely, 2^20747664530 is an apocalyptic number.

20747664530 is a deficient number, since it is larger than the sum of its proper divisors (17651616670).

20747664530 is a wasteful number, since it uses less digits than its factorization.

20747664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64574.

The product of its (nonzero) digits is 846720, while the sum is 44.

The spelling of 20747664530 in words is "twenty billion, seven hundred forty-seven million, six hundred sixty-four thousand, five hundred thirty".