20943353 has 4 divisors (see below), whose sum is σ = 20961780. Its totient is φ = 20924928.

The previous prime is 20943323. The next prime is 20943359. The reversal of 20943353 is 35334902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8248384 + 12694969 = 2872^2 + 3563^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943353 - 2²⁴ = 4166137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20943359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7388 + ... + 9821.

It is an arithmetic number, because the mean of its divisors is an integer number (5240445).

Almost surely, 2^20943353 is an apocalyptic number.

It is an amenable number.

20943353 is a deficient number, since it is larger than the sum of its proper divisors (18427).

20943353 is a wasteful number, since it uses less digits than its factorization.

20943353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18426.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 20943353 is about 4576.3908268416. The cubic root of 20943353 is about 275.6441231721.

The spelling of 20943353 in words is "twenty million, nine hundred forty-three thousand, three hundred fifty-three".