420632818 has 4 divisors (see below), whose sum is σ = 630949230. Its totient is φ = 210316408.

The previous prime is 420632813. The next prime is 420632827. The reversal of 420632818 is 818236024.

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

It can be written as a sum of positive squares in only one way, i.e., 294362649 + 126270169 = 17157^2 + 11237^2 .

It is a super-2 number, since 2×420632818² = 353863935157242248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420632813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105158203 + ... + 105158206.

Almost surely, 2^420632818 is an apocalyptic number.

420632818 is a deficient number, since it is larger than the sum of its proper divisors (210316412).

420632818 is a wasteful number, since it uses less digits than its factorization.

420632818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210316411.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 420632818 is about 20509.3348990161. The cubic root of 420632818 is about 749.2631684910.

The spelling of 420632818 in words is "four hundred twenty million, six hundred thirty-two thousand, eight hundred eighteen".