20638230 has 32 divisors (see below), whose sum is σ = 50873184. Its totient is φ = 5354496.

The previous prime is 20638229. The next prime is 20638243. The reversal of 20638230 is 3283602.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20638230.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8187 + ... + 10406.

It is an arithmetic number, because the mean of its divisors is an integer number (1589787).

Almost surely, 2^20638230 is an apocalyptic number.

20638230 is an abundant number, since it is smaller than the sum of its proper divisors (30234954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20638230 is a wasteful number, since it uses less digits than its factorization.

20638230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18640.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20638230 is about 4542.9318727007. The cubic root of 20638230 is about 274.2989526566.

The spelling of 20638230 in words is "twenty million, six hundred thirty-eight thousand, two hundred thirty".