20943311 has 4 divisors (see below), whose sum is σ = 20953824. Its totient is φ = 20932800.

The previous prime is 20943287. The next prime is 20943319. The reversal of 20943311 is 11334902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20943311 - 2¹⁰ = 20942287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943319) 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, 1250 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (5238456).

Almost surely, 2^20943311 is an apocalyptic number.

20943311 is a deficient number, since it is larger than the sum of its proper divisors (10513).

20943311 is an equidigital number, since it uses as much as digits as its factorization.

20943311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20943311 is about 4576.3862380704. The cubic root of 20943311 is about 275.6439389122.

The spelling of 20943311 in words is "twenty million, nine hundred forty-three thousand, three hundred eleven".