33020280 has 144 divisors (see below), whose sum is σ = 111940920. Its totient is φ = 8439552.

The previous prime is 33020261. The next prime is 33020287. The reversal of 33020280 is 8202033.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33020287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 492807 + ... + 492873.

Almost surely, 2^33020280 is an apocalyptic number.

33020280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33020280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55970460).

33020280 is an abundant number, since it is smaller than the sum of its proper divisors (78920640).

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

33020280 is a wasteful number, since it uses less digits than its factorization.

33020280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 33020280 is about 5746.3275228619. The cubic root of 33020280 is about 320.8191253992.

The spelling of 33020280 in words is "thirty-three million, twenty thousand, two hundred eighty".