20661333 has 16 divisors (see below), whose sum is σ = 34346496. Its totient is φ = 10733040.

The previous prime is 20661323. The next prime is 20661367. The reversal of 20661333 is 33316602.

It is not a de Polignac number, because 20661333 - 2⁵ = 20661301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44491 + ... + 44952.

It is an arithmetic number, because the mean of its divisors is an integer number (2146656).

Almost surely, 2^20661333 is an apocalyptic number.

It is an amenable number.

20661333 is a deficient number, since it is larger than the sum of its proper divisors (13685163).

20661333 is a wasteful number, since it uses less digits than its factorization.

20661333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89464.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 20661333 is about 4545.4739026861. The cubic root of 20661333 is about 274.4012670753.

Adding to 20661333 its reverse (33316602), we get a palindrome (53977935).

The spelling of 20661333 in words is "twenty million, six hundred sixty-one thousand, three hundred thirty-three".