20250997636 has 9 divisors (see below), whose sum is σ = 35439743941. Its totient is φ = 10125356512.

The previous prime is 20250997607. The next prime is 20250997643. The reversal of 20250997636 is 63679905202.

The square root of 20250997636 is 142306.

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

It can be written as a sum of positive squares in only one way, i.e., 945562500 + 19305435136 = 30750^2 + 138944^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20250997636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 249036 + ... + 320188.

Almost surely, 2^20250997636 is an apocalyptic number.

20250997636 is the 142306-th square number.

It is an amenable number.

20250997636 is a deficient number, since it is larger than the sum of its proper divisors (15188746305).

20250997636 is an frugal number, since it uses more digits than its factorization.

20250997636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142310 (or 71155 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 49.

Multiplying 20250997636 by its sum of digits (49), we get a square (992298884164 = 996142²).

The spelling of 20250997636 in words is "twenty billion, two hundred fifty million, nine hundred ninety-seven thousand, six hundred thirty-six".