8420420 has 24 divisors (see below), whose sum is σ = 18614400. Its totient is φ = 3190752.

The previous prime is 8420413. The next prime is 8420441. The reversal of 8420420 is 240248.

8420420 = 356² + 357² + ... + 412².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 8420392 and 8420401.

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, 10700 + ... + 11459.

It is an arithmetic number, because the mean of its divisors is an integer number (775600).

Almost surely, 2^8420420 is an apocalyptic number.

It is an amenable number.

8420420 is an abundant number, since it is smaller than the sum of its proper divisors (10193980).

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

8420420 is a wasteful number, since it uses less digits than its factorization.

8420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22187 (or 22185 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 8420420 is about 2901.7959955862. The cubic root of 8420420 is about 203.4438588098.

Adding to 8420420 its reverse (240248), we get a palindrome (8660668).

The spelling of 8420420 in words is "eight million, four hundred twenty thousand, four hundred twenty".