420813660 has 24 divisors (see below), whose sum is σ = 1178278416. Its totient is φ = 112216960.

The previous prime is 420813629. The next prime is 420813671. The reversal of 420813660 is 66318024.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506721 + ... + 3506840.

It is an arithmetic number, because the mean of its divisors is an integer number (49094934).

Almost surely, 2^420813660 is an apocalyptic number.

It is an amenable number.

420813660 is an abundant number, since it is smaller than the sum of its proper divisors (757464756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420813660 is a wasteful number, since it uses less digits than its factorization.

420813660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013573 (or 7013571 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 420813660 is about 20513.7431981586. The cubic root of 420813660 is about 749.3705296150.

The spelling of 420813660 in words is "four hundred twenty million, eight hundred thirteen thousand, six hundred sixty".