420655605 has 16 divisors (see below), whose sum is σ = 679585920. Its totient is φ = 222170688.

The previous prime is 420655591. The next prime is 420655639. The reversal of 420655605 is 506556024.

It is a happy number.

It is not a de Polignac number, because 420655605 - 2⁹ = 420655093 is a prime.

It is a super-2 number, since 2×420655605² = 353902276035832050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134590 + ... + 137679.

It is an arithmetic number, because the mean of its divisors is an integer number (42474120).

Almost surely, 2^420655605 is an apocalyptic number.

It is an amenable number.

420655605 is a deficient number, since it is larger than the sum of its proper divisors (258930315).

420655605 is a wasteful number, since it uses less digits than its factorization.

420655605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272380.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 420655605 is about 20509.8904190149. The cubic root of 420655605 is about 749.2766982259.

The spelling of 420655605 in words is "four hundred twenty million, six hundred fifty-five thousand, six hundred five".