220008391 has 8 divisors (see below), whose sum is σ = 231747120. Its totient is φ = 208285632.

The previous prime is 220008389. The next prime is 220008403. The reversal of 220008391 is 193800022.

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

It is a cyclic number.

It is not a de Polignac number, because 220008391 - 2¹ = 220008389 is a prime.

It is a super-2 number, since 2×220008391² = 96807384220817762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220008301) 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, 33321 + ... + 39373.

It is an arithmetic number, because the mean of its divisors is an integer number (28968390).

Almost surely, 2^220008391 is an apocalyptic number.

220008391 is a deficient number, since it is larger than the sum of its proper divisors (11738729).

220008391 is a wasteful number, since it uses less digits than its factorization.

220008391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 220008391 is about 14832.6798320465. The cubic root of 220008391 is about 603.6887485638.

The spelling of 220008391 in words is "two hundred twenty million, eight thousand, three hundred ninety-one".