421306020 has 72 divisors (see below), whose sum is σ = 1299654720. Its totient is φ = 110441280.

The previous prime is 421306001. The next prime is 421306031. The reversal of 421306020 is 20603124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421305984 and 421306002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9216 + ... + 30455.

It is an arithmetic number, because the mean of its divisors is an integer number (18050760).

Almost surely, 2^421306020 is an apocalyptic number.

It is an amenable number.

421306020 is an abundant number, since it is smaller than the sum of its proper divisors (878348700).

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

421306020 is a wasteful number, since it uses less digits than its factorization.

421306020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39745 (or 39740 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 421306020 is about 20525.7404251345. The cubic root of 421306020 is about 749.6626749718.

Adding to 421306020 its reverse (20603124), we get a palindrome (441909144).

The spelling of 421306020 in words is "four hundred twenty-one million, three hundred six thousand, twenty".