33220505 has 4 divisors (see below), whose sum is σ = 39864612. Its totient is φ = 26576400.

The previous prime is 33220483. The next prime is 33220507. The reversal of 33220505 is 50502233.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16801801 + 16418704 = 4099^2 + 4052^2 .

It is not a de Polignac number, because 33220505 - 2⁸ = 33220249 is a prime.

It is a super-2 number, since 2×33220505² = 2207203904910050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33220507) 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 3 ways as a sum of consecutive naturals, for example, 3322046 + ... + 3322055.

It is an arithmetic number, because the mean of its divisors is an integer number (9966153).

Almost surely, 2^33220505 is an apocalyptic number.

It is an amenable number.

33220505 is a deficient number, since it is larger than the sum of its proper divisors (6644107).

33220505 is an equidigital number, since it uses as much as digits as its factorization.

33220505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644106.

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 33220505 is about 5763.7231890506. The cubic root of 33220505 is about 321.4662692058.

Adding to 33220505 its reverse (50502233), we get a palindrome (83722738).

The spelling of 33220505 in words is "thirty-three million, two hundred twenty thousand, five hundred five".