220317493 has 4 divisors (see below), whose sum is σ = 240346368. Its totient is φ = 200288620.

The previous prime is 220317463. The next prime is 220317497. The reversal of 220317493 is 394713022.

220317493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220317493 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220317497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10014421 + ... + 10014442.

It is an arithmetic number, because the mean of its divisors is an integer number (60086592).

Almost surely, 2^220317493 is an apocalyptic number.

It is an amenable number.

220317493 is a deficient number, since it is larger than the sum of its proper divisors (20028875).

220317493 is a wasteful number, since it uses less digits than its factorization.

220317493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20028874.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 220317493 is about 14843.0958024261. The cubic root of 220317493 is about 603.9713348749.

It can be divided in two parts, 220 and 317493, that added together give a palindrome (317713).

The spelling of 220317493 in words is "two hundred twenty million, three hundred seventeen thousand, four hundred ninety-three".