220420405 has 8 divisors (see below), whose sum is σ = 265671072. Its totient is φ = 175558608.

The previous prime is 220420393. The next prime is 220420411. The reversal of 220420405 is 504024022.

220420405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 220420405 - 2¹⁵ = 220387637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95967 + ... + 98236.

It is an arithmetic number, because the mean of its divisors is an integer number (33208884).

Almost surely, 2^220420405 is an apocalyptic number.

It is an amenable number.

220420405 is a deficient number, since it is larger than the sum of its proper divisors (45250667).

220420405 is a wasteful number, since it uses less digits than its factorization.

220420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194435.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 220420405 is about 14846.5620599518. The cubic root of 220420405 is about 604.0653601258.

Adding to 220420405 its reverse (504024022), we get a palindrome (724444427).

The spelling of 220420405 in words is "two hundred twenty million, four hundred twenty thousand, four hundred five".