84090020 has 48 divisors (see below), whose sum is σ = 202704768. Its totient is φ = 28704000.

The previous prime is 84089989. The next prime is 84090059. The reversal of 84090020 is 2009048.

It is a super-2 number, since 2×84090020² = 14142262927200800, which contains 22 as substring.

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, 33944 + ... + 36336.

It is an arithmetic number, because the mean of its divisors is an integer number (4223016).

Almost surely, 2^84090020 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 84090020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101352384).

84090020 is an abundant number, since it is smaller than the sum of its proper divisors (118614748).

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

84090020 is a wasteful number, since it uses less digits than its factorization.

84090020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 84090020 is about 9170.0610684989. The cubic root of 84090020 is about 438.1083042919.

Adding to 84090020 its reverse (2009048), we get a palindrome (86099068).

The spelling of 84090020 in words is "eighty-four million, ninety thousand, twenty".