20985737488 has 20 divisors (see below), whose sum is σ = 41216853148. Its totient is φ = 10349130240.

The previous prime is 20985737477. The next prime is 20985737551. The reversal of 20985737488 is 88473758902.

It can be written as a sum of positive squares in 2 ways, for example, as 9582060544 + 11403676944 = 97888^2 + 106788^2 .

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, 8982453 + ... + 8984788.

Almost surely, 2^20985737488 is an apocalyptic number.

It is an amenable number.

20985737488 is a deficient number, since it is larger than the sum of its proper divisors (20231115660).

20985737488 is a wasteful number, since it uses less digits than its factorization.

20985737488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17967322 (or 17967316 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 20985737488 in words is "twenty billion, nine hundred eighty-five million, seven hundred thirty-seven thousand, four hundred eighty-eight".