33820681 has 4 divisors (see below), whose sum is σ = 34284052. Its totient is φ = 33357312.

The previous prime is 33820679. The next prime is 33820687. The reversal of 33820681 is 18602833.

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 15681600 + 18139081 = 3960^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 33820681 - 2¹ = 33820679 is a prime.

It is a super-2 number, since 2×33820681² = 2287676926607522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33820687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231576 + ... + 231721.

It is an arithmetic number, because the mean of its divisors is an integer number (8571013).

Almost surely, 2^33820681 is an apocalyptic number.

It is an amenable number.

33820681 is a deficient number, since it is larger than the sum of its proper divisors (463371).

33820681 is an equidigital number, since it uses as much as digits as its factorization.

33820681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463370.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 33820681 is about 5815.5550895852. Note that the first 3 decimals coincide. The cubic root of 33820681 is about 323.3906426445.

The spelling of 33820681 in words is "thirty-three million, eight hundred twenty thousand, six hundred eighty-one".