20297136616 has 16 divisors (see below), whose sum is σ = 38059913700. Its totient is φ = 10147826304.

The previous prime is 20297136611. The next prime is 20297136641. The reversal of 20297136616 is 61663179202.

It can be written as a sum of positive squares in 2 ways, for example, as 19218276900 + 1078859716 = 138630^2 + 32846^2 .

It is not an unprimeable number, because it can be changed into a prime (20297136611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33636 + ... + 204268.

Almost surely, 2^20297136616 is an apocalyptic number.

It is an amenable number.

20297136616 is a deficient number, since it is larger than the sum of its proper divisors (17762777084).

20297136616 is a wasteful number, since it uses less digits than its factorization.

20297136616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185508 (or 185504 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

It can be divided in two parts, 2029713 and 6616, that added together give a square (2036329 = 1427²).

The spelling of 20297136616 in words is "twenty billion, two hundred ninety-seven million, one hundred thirty-six thousand, six hundred sixteen".