84405020 has 48 divisors (see below), whose sum is σ = 203286720. Its totient is φ = 28836864.

The previous prime is 84404981. The next prime is 84405053. The reversal of 84405020 is 2050448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46286 + ... + 48074.

It is an arithmetic number, because the mean of its divisors is an integer number (4235140).

Almost surely, 2^84405020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84405020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101643360).

84405020 is an abundant number, since it is smaller than the sum of its proper divisors (118881700).

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

84405020 is a wasteful number, since it uses less digits than its factorization.

84405020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2140 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 84405020 is about 9187.2204719382. The cubic root of 84405020 is about 438.6546717566.

Adding to 84405020 its reverse (2050448), we get a palindrome (86455468).

The spelling of 84405020 in words is "eighty-four million, four hundred five thousand, twenty".