420615205 has 4 divisors (see below), whose sum is σ = 504738252. Its totient is φ = 336492160.

The previous prime is 420615203. The next prime is 420615211. The reversal of 420615205 is 502516024.

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 280026756 + 140588449 = 16734^2 + 11857^2 .

It is not a de Polignac number, because 420615205 - 2¹ = 420615203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420615205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420615203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42061516 + ... + 42061525.

It is an arithmetic number, because the mean of its divisors is an integer number (126184563).

Almost surely, 2^420615205 is an apocalyptic number.

It is an amenable number.

420615205 is a deficient number, since it is larger than the sum of its proper divisors (84123047).

420615205 is an equidigital number, since it uses as much as digits as its factorization.

420615205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84123046.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 420615205 is about 20508.9055046826. The cubic root of 420615205 is about 749.2527104733.

The spelling of 420615205 in words is "four hundred twenty million, six hundred fifteen thousand, two hundred five".