83840020 has 48 divisors (see below), whose sum is σ = 193233600. Its totient is φ = 30302720.

The previous prime is 83840017. The next prime is 83840033. The reversal of 83840020 is 2004838.

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, 38316 + ... + 40444.

It is an arithmetic number, because the mean of its divisors is an integer number (4025700).

Almost surely, 2^83840020 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 83840020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96616800).

83840020 is an abundant number, since it is smaller than the sum of its proper divisors (109393580).

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

83840020 is a wasteful number, since it uses less digits than its factorization.

83840020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 83840020 is about 9156.4196059377. The cubic root of 83840020 is about 437.6737073477.

Adding to 83840020 its reverse (2004838), we get a palindrome (85844858).

The spelling of 83840020 in words is "eighty-three million, eight hundred forty thousand, twenty".