420690205 has 8 divisors (see below), whose sum is σ = 543661272. Its totient is φ = 310663488.

The previous prime is 420690197. The next prime is 420690227. The reversal of 420690205 is 502096024.

It can be written as a sum of positive squares in 4 ways, for example, as 45454564 + 375235641 = 6742^2 + 19371^2 .

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 420690205 - 2³ = 420690197 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, 3236014 + ... + 3236143.

It is an arithmetic number, because the mean of its divisors is an integer number (67957659).

Almost surely, 2^420690205 is an apocalyptic number.

It is an amenable number.

420690205 is a deficient number, since it is larger than the sum of its proper divisors (122971067).

420690205 is a wasteful number, since it uses less digits than its factorization.

420690205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472175.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 420690205 is about 20510.7338971574. The cubic root of 420690205 is about 749.2972409713.

The spelling of 420690205 in words is "four hundred twenty million, six hundred ninety thousand, two hundred five".