420020008 has 16 divisors (see below), whose sum is σ = 787963680. Its totient is φ = 209896368.

The previous prime is 420019993. The next prime is 420020009. The reversal of 420020008 is 800020024.

It is a junction number, because it is equal to n+sod(n) for n = 420019973 and 420020000.

It is not an unprimeable number, because it can be changed into a prime (420020009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2685 + ... + 29107.

It is an arithmetic number, because the mean of its divisors is an integer number (49247730).

Almost surely, 2^420020008 is an apocalyptic number.

It is an amenable number.

420020008 is a deficient number, since it is larger than the sum of its proper divisors (367943672).

420020008 is a wasteful number, since it uses less digits than its factorization.

420020008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28416 (or 28412 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 420020008 is about 20494.3896713222. The cubic root of 420020008 is about 748.8991303869.

Adding to 420020008 its sum of digits (16), we get a palindrome (420020024).

The spelling of 420020008 in words is "four hundred twenty million, twenty thousand, eight".