220990393 has 8 divisors (see below), whose sum is σ = 239589000. Its totient is φ = 202620288.

The previous prime is 220990339. The next prime is 220990409. The reversal of 220990393 is 393099022.

220990393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2039184 + 218951209 = 1428^2 + 14797^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-220990393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220990303) 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, 55108 + ... + 58981.

It is an arithmetic number, because the mean of its divisors is an integer number (29948625).

Almost surely, 2^220990393 is an apocalyptic number.

It is an amenable number.

220990393 is a deficient number, since it is larger than the sum of its proper divisors (18598607).

220990393 is a wasteful number, since it uses less digits than its factorization.

220990393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114251.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 220990393 is about 14865.7456254303. The cubic root of 220990393 is about 604.5855987835.

The spelling of 220990393 in words is "two hundred twenty million, nine hundred ninety thousand, three hundred ninety-three".