20997528277636 has 27 divisors (see below), whose sum is σ = 38781767533719. Its totient is φ = 9946115123688.

The previous prime is 20997528277549. The next prime is 20997528277651. The reversal of 20997528277636 is 63677282579902.

The square root of 20997528277636 is 4582306.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 174067335 + ... + 174187921.

Almost surely, 2^{20997528277636} is an apocalyptic number.

20997528277636 is the 4582306-th square number.

It is an amenable number.

20997528277636 is a deficient number, since it is larger than the sum of its proper divisors (17784239256083).

20997528277636 is an frugal number, since it uses more digits than its factorization.

20997528277636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241216 (or 120608 counting only the distinct ones).

The product of its (nonzero) digits is 960180480, while the sum is 73.

The spelling of 20997528277636 in words is "twenty trillion, nine hundred ninety-seven billion, five hundred twenty-eight million, two hundred seventy-seven thousand, six hundred thirty-six".