20533338 has 80 divisors (see below), whose sum is σ = 55408320. Its totient is φ = 5552064.

The previous prime is 20533327. The next prime is 20533339. The reversal of 20533338 is 83333502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20533339) 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 39 ways as a sum of consecutive naturals, for example, 21070 + ... + 22022.

It is an arithmetic number, because the mean of its divisors is an integer number (692604).

Almost surely, 2^20533338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20533338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27704160).

20533338 is an abundant number, since it is smaller than the sum of its proper divisors (34874982).

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

20533338 is a wasteful number, since it uses less digits than its factorization.

20533338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 20533338 is about 4531.3726397197. The cubic root of 20533338 is about 273.8334630099.

The spelling of 20533338 in words is "twenty million, five hundred thirty-three thousand, three hundred thirty-eight".