20960399 has 4 divisors (see below), whose sum is σ = 21315720. Its totient is φ = 20605080.

The previous prime is 20960377. The next prime is 20960413. The reversal of 20960399 is 99306902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20960399 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 (20960339) 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, 177572 + ... + 177689.

It is an arithmetic number, because the mean of its divisors is an integer number (5328930).

Almost surely, 2^20960399 is an apocalyptic number.

20960399 is a deficient number, since it is larger than the sum of its proper divisors (355321).

20960399 is an equidigital number, since it uses as much as digits as its factorization.

20960399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355320.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 20960399 is about 4578.2528326863. The cubic root of 20960399 is about 275.7188860423.

The spelling of 20960399 in words is "twenty million, nine hundred sixty thousand, three hundred ninety-nine".