33681820 has 12 divisors (see below), whose sum is σ = 70731864. Its totient is φ = 13472720.

The previous prime is 33681773. The next prime is 33681827. The reversal of 33681820 is 2818633.

It is a super-2 number, since 2×33681820² = 2268929997024800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33681827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842026 + ... + 842065.

It is an arithmetic number, because the mean of its divisors is an integer number (5894322).

Almost surely, 2^33681820 is an apocalyptic number.

It is an amenable number.

33681820 is an abundant number, since it is smaller than the sum of its proper divisors (37050044).

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

33681820 is a wasteful number, since it uses less digits than its factorization.

33681820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684100 (or 1684098 counting only the distinct ones).

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

The square root of 33681820 is about 5803.6040526556. The cubic root of 33681820 is about 322.9474429402.

The spelling of 33681820 in words is "thirty-three million, six hundred eighty-one thousand, eight hundred twenty".