220340405 has 16 divisors (see below), whose sum is σ = 282355200. Its totient is φ = 164700480.

The previous prime is 220340399. The next prime is 220340431. The reversal of 220340405 is 504043022.

It is not a de Polignac number, because 220340405 - 2⁴ = 220340389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20015 + ... + 29004.

It is an arithmetic number, because the mean of its divisors is an integer number (17647200).

Almost surely, 2^220340405 is an apocalyptic number.

It is an amenable number.

220340405 is a deficient number, since it is larger than the sum of its proper divisors (62014795).

220340405 is a wasteful number, since it uses less digits than its factorization.

220340405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49084.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 220340405 is about 14843.8675890079. The cubic root of 220340405 is about 603.9922708907.

Adding to 220340405 its reverse (504043022), we get a palindrome (724383427).

The spelling of 220340405 in words is "two hundred twenty million, three hundred forty thousand, four hundred five".