20133261 has 12 divisors (see below), whose sum is σ = 29139292. Its totient is φ = 13395456.

The previous prime is 20133251. The next prime is 20133277. The reversal of 20133261 is 16233102.

It can be written as a sum of positive squares in 2 ways, for example, as 14402025 + 5731236 = 3795^2 + 2394^2 .

It is not a de Polignac number, because 20133261 - 2¹⁷ = 20002189 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3255 + ... + 7131.

Almost surely, 2^20133261 is an apocalyptic number.

It is an amenable number.

20133261 is a deficient number, since it is larger than the sum of its proper divisors (9006031).

20133261 is a wasteful number, since it uses less digits than its factorization.

20133261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20133261 is about 4487.0102518269. The cubic root of 20133261 is about 272.0433042717.

Adding to 20133261 its reverse (16233102), we get a palindrome (36366363).

The spelling of 20133261 in words is "twenty million, one hundred thirty-three thousand, two hundred sixty-one".