20943993 has 8 divisors (see below), whose sum is σ = 31914688. Its totient is φ = 11967984.

The previous prime is 20943991. The next prime is 20944019. The reversal of 20943993 is 39934902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20943993 - 2¹ = 20943991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20943991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498646 + ... + 498687.

It is an arithmetic number, because the mean of its divisors is an integer number (3989336).

Almost surely, 2^20943993 is an apocalyptic number.

It is an amenable number.

20943993 is a deficient number, since it is larger than the sum of its proper divisors (10970695).

20943993 is an equidigital number, since it uses as much as digits as its factorization.

20943993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997343.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 20943993 is about 4576.4607504053. The cubic root of 20943993 is about 275.6469309116.

The spelling of 20943993 in words is "twenty million, nine hundred forty-three thousand, nine hundred ninety-three".