420905155 has 24 divisors (see below), whose sum is σ = 570212496. Its totient is φ = 297823680.

The previous prime is 420905143. The next prime is 420905161. The reversal of 420905155 is 551509024.

It is not a de Polignac number, because 420905155 - 2¹¹ = 420903107 is a prime.

It is a super-2 number, since 2×420905155² = 354322299011148050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12984 + ... + 31786.

It is an arithmetic number, because the mean of its divisors is an integer number (23758854).

Almost surely, 2^420905155 is an apocalyptic number.

420905155 is a deficient number, since it is larger than the sum of its proper divisors (149307341).

420905155 is a wasteful number, since it uses less digits than its factorization.

420905155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18867 (or 18856 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 420905155 is about 20515.9731672665. The cubic root of 420905155 is about 749.4248360651.

The spelling of 420905155 in words is "four hundred twenty million, nine hundred five thousand, one hundred fifty-five".