420905655 has 24 divisors (see below), whose sum is σ = 732225312. Its totient is φ = 223665984.

The previous prime is 420905627. The next prime is 420905659. The reversal of 420905655 is 556509024.

420905655 is a `hidden beast` number, since 4 + 2 + 0 + 90 + 565 + 5 = 666.

It is not a de Polignac number, because 420905655 - 2⁹ = 420905143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420905659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4419 + ... + 29348.

It is an arithmetic number, because the mean of its divisors is an integer number (30509388).

Almost surely, 2^420905655 is an apocalyptic number.

420905655 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

420905655 is a deficient number, since it is larger than the sum of its proper divisors (311319657).

420905655 is a wasteful number, since it uses less digits than its factorization.

420905655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34055 (or 34052 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 420905655 is about 20515.9853528901. The cubic root of 420905655 is about 749.4251328162.

The spelling of 420905655 in words is "four hundred twenty million, nine hundred five thousand, six hundred fifty-five".