33091020 has 72 divisors (see below), whose sum is σ = 104753376. Its totient is φ = 8439552.

The previous prime is 33091013. The next prime is 33091031. The reversal of 33091020 is 2019033.

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 = 33090984 and 33091002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144 + ... + 8136.

It is an arithmetic number, because the mean of its divisors is an integer number (1454908).

Almost surely, 2^33091020 is an apocalyptic number.

33091020 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 33091020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52376688).

33091020 is an abundant number, since it is smaller than the sum of its proper divisors (71662356).

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

33091020 is a wasteful number, since it uses less digits than its factorization.

33091020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031 (or 8026 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 33091020 is about 5752.4794654132. The cubic root of 33091020 is about 321.0480610485.

The spelling of 33091020 in words is "thirty-three million, ninety-one thousand, twenty".