220391004 has 12 divisors (see below), whose sum is σ = 514245704. Its totient is φ = 73463664.

The previous prime is 220390999. The next prime is 220391011. The reversal of 220391004 is 400193022.

220391004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9182947 + ... + 9182970.

Almost surely, 2^220391004 is an apocalyptic number.

It is an amenable number.

220391004 is an abundant number, since it is smaller than the sum of its proper divisors (293854700).

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

220391004 is a wasteful number, since it uses less digits than its factorization.

220391004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18365924 (or 18365922 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 220391004 is about 14845.5718650377. The cubic root of 220391004 is about 604.0385009740.

The spelling of 220391004 in words is "two hundred twenty million, three hundred ninety-one thousand, four".