420645563 has 12 divisors (see below), whose sum is σ = 467809488. Its totient is φ = 377788320.

The previous prime is 420645557. The next prime is 420645571. The reversal of 420645563 is 365546024.

It is a happy number.

It is not a de Polignac number, because 420645563 - 2²⁰ = 419596987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420645583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27383 + ... + 39888.

It is an arithmetic number, because the mean of its divisors is an integer number (38984124).

Almost surely, 2^420645563 is an apocalyptic number.

420645563 is a deficient number, since it is larger than the sum of its proper divisors (47163925).

420645563 is a wasteful number, since it uses less digits than its factorization.

420645563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67334 (or 67321 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 420645563 is about 20509.6456088349. The cubic root of 420645563 is about 749.2707358690.

The spelling of 420645563 in words is "four hundred twenty million, six hundred forty-five thousand, five hundred sixty-three".