20997333 has 48 divisors (see below), whose sum is σ = 36936000. Its totient is φ = 11751264.

The previous prime is 20997313. The next prime is 20997349. The reversal of 20997333 is 33379902.

It is not a de Polignac number, because 20997333 - 2⁶ = 20997269 is a prime.

It is a super-2 number, since 2×20997333² = 881775986225778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997313) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77923 + ... + 78191.

It is an arithmetic number, because the mean of its divisors is an integer number (769500).

Almost surely, 2^20997333 is an apocalyptic number.

It is an amenable number.

20997333 is a deficient number, since it is larger than the sum of its proper divisors (15938667).

20997333 is a wasteful number, since it uses less digits than its factorization.

20997333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 36.

The square root of 20997333 is about 4582.2846921596. The cubic root of 20997333 is about 275.8807376980.

The spelling of 20997333 in words is "twenty million, nine hundred ninety-seven thousand, three hundred thirty-three".