20638850 has 24 divisors (see below), whose sum is σ = 40648068. Its totient is φ = 7769600.

The previous prime is 20638819. The next prime is 20638853. The reversal of 20638850 is 5883602.

It is a Cunningham number, because it is equal to 4543²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 16072081 + 4566769 = 4009^2 + 2137^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20638853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11291 + ... + 12990.

Almost surely, 2^20638850 is an apocalyptic number.

20638850 is a deficient number, since it is larger than the sum of its proper divisors (20009218).

20638850 is a wasteful number, since it uses less digits than its factorization.

20638850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24310 (or 24305 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20638850 is about 4543.0001100594. Note that the first 3 decimals coincide. The cubic root of 20638850 is about 274.3016993980.

The spelling of 20638850 in words is "twenty million, six hundred thirty-eight thousand, eight hundred fifty".