420447305 has 4 divisors (see below), whose sum is σ = 504536772. Its totient is φ = 336357840.

The previous prime is 420447299. The next prime is 420447323. The reversal of 420447305 is 503744024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103144336 + 317302969 = 10156^2 + 17813^2 .

It is not a de Polignac number, because 420447305 - 2⁶ = 420447241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42044726 + ... + 42044735.

It is an arithmetic number, because the mean of its divisors is an integer number (126134193).

Almost surely, 2^420447305 is an apocalyptic number.

It is an amenable number.

420447305 is a deficient number, since it is larger than the sum of its proper divisors (84089467).

420447305 is an equidigital number, since it uses as much as digits as its factorization.

420447305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84089466.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 420447305 is about 20504.8117523668. The cubic root of 420447305 is about 749.1530023386.

The spelling of 420447305 in words is "four hundred twenty million, four hundred forty-seven thousand, three hundred five".