20818230 has 32 divisors (see below), whose sum is σ = 51688800. Its totient is φ = 5359872.

The previous prime is 20818229. The next prime is 20818247. The reversal of 20818230 is 3281802.

It is a self number, because there is not a number n which added to its sum of digits gives 20818230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11095 + ... + 12834.

It is an arithmetic number, because the mean of its divisors is an integer number (1615275).

Almost surely, 2^20818230 is an apocalyptic number.

20818230 is an abundant number, since it is smaller than the sum of its proper divisors (30870570).

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

20818230 is a wasteful number, since it uses less digits than its factorization.

20818230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23968.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20818230 is about 4562.6998586363. The cubic root of 20818230 is about 275.0940945225.

The spelling of 20818230 in words is "twenty million, eight hundred eighteen thousand, two hundred thirty".