80440020 has 96 divisors (see below), whose sum is σ = 251946240. Its totient is φ = 21306240.

The previous prime is 80439973. The next prime is 80440021. The reversal of 80440020 is 2004408.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 80439975 and 80440002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80440021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97329 + ... + 98151.

It is an arithmetic number, because the mean of its divisors is an integer number (2624440).

Almost surely, 2^80440020 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 80440020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125973120).

80440020 is an abundant number, since it is smaller than the sum of its proper divisors (171506220).

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

80440020 is a wasteful number, since it uses less digits than its factorization.

80440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 80440020 is about 8968.8360448834. The cubic root of 80440020 is about 431.6754893191.

Adding to 80440020 its reverse (2004408), we get a palindrome (82444428).

The spelling of 80440020 in words is "eighty million, four hundred forty thousand, twenty".