420220405 has 8 divisors (see below), whose sum is σ = 550106784. Its totient is φ = 305614800.

The previous prime is 420220369. The next prime is 420220429. The reversal of 420220405 is 504022024.

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

It is not a de Polignac number, because 420220405 - 2¹⁷ = 420089333 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, 3820131 + ... + 3820240.

It is an arithmetic number, because the mean of its divisors is an integer number (68763348).

Almost surely, 2^420220405 is an apocalyptic number.

It is an amenable number.

420220405 is a deficient number, since it is larger than the sum of its proper divisors (129886379).

420220405 is a wasteful number, since it uses less digits than its factorization.

420220405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640387.

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

The square root of 420220405 is about 20499.2781580230. The cubic root of 420220405 is about 749.0182146167.

Adding to 420220405 its reverse (504022024), we get a palindrome (924242429).

The spelling of 420220405 in words is "four hundred twenty million, two hundred twenty thousand, four hundred five".