420405566 has 16 divisors (see below), whose sum is σ = 728127456. Its totient is φ = 178315776.

The previous prime is 420405551. The next prime is 420405577. The reversal of 420405566 is 665504024.

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, 153431 + ... + 156146.

It is an arithmetic number, because the mean of its divisors is an integer number (45507966).

Almost surely, 2^420405566 is an apocalyptic number.

420405566 is a deficient number, since it is larger than the sum of its proper divisors (307721890).

420405566 is a wasteful number, since it uses less digits than its factorization.

420405566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309683.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 420405566 is about 20503.7939416099. The cubic root of 420405566 is about 749.1282113350.

The spelling of 420405566 in words is "four hundred twenty million, four hundred five thousand, five hundred sixty-six".