420170020 has 12 divisors (see below), whose sum is σ = 882357084. Its totient is φ = 168068000.

The previous prime is 420169921. The next prime is 420170021. The reversal of 420170020 is 20071024.

It can be written as a sum of positive squares in 2 ways, for example, as 313502436 + 106667584 = 17706^2 + 10328^2 .

It is a junction number, because it is equal to n+sod(n) for n = 420169976 and 420170003.

It is not an unprimeable number, because it can be changed into a prime (420170021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10504231 + ... + 10504270.

It is an arithmetic number, because the mean of its divisors is an integer number (73529757).

Almost surely, 2^420170020 is an apocalyptic number.

It is an amenable number.

420170020 is an abundant number, since it is smaller than the sum of its proper divisors (462187064).

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

420170020 is a wasteful number, since it uses less digits than its factorization.

420170020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21008510 (or 21008508 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 420170020 is about 20498.0491754703. The cubic root of 420170020 is about 748.9882773181.

The spelling of 420170020 in words is "four hundred twenty million, one hundred seventy thousand, twenty".