20218830 has 16 divisors (see below), whose sum is σ = 48525264. Its totient is φ = 5391680.

The previous prime is 20218819. The next prime is 20218837. The reversal of 20218830 is 3881202.

It is a self number, because there is not a number n which added to its sum of digits gives 20218830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336951 + ... + 337010.

It is an arithmetic number, because the mean of its divisors is an integer number (3032829).

Almost surely, 2^20218830 is an apocalyptic number.

20218830 is an abundant number, since it is smaller than the sum of its proper divisors (28306434).

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

20218830 is a wasteful number, since it uses less digits than its factorization.

20218830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673971.

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

The square root of 20218830 is about 4496.5353328980. The cubic root of 20218830 is about 272.4281661229.

The spelling of 20218830 in words is "twenty million, two hundred eighteen thousand, eight hundred thirty".