20399343 has 4 divisors (see below), whose sum is σ = 27199128. Its totient is φ = 13599560.

The previous prime is 20399341. The next prime is 20399347. The reversal of 20399343 is 34399302.

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

It is a cyclic number.

It is not a de Polignac number, because 20399343 - 2¹ = 20399341 is a prime.

It is a super-2 number, since 2×20399343² = 832266389663298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399341) 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, 3399888 + ... + 3399893.

It is an arithmetic number, because the mean of its divisors is an integer number (6799782).

Almost surely, 2^20399343 is an apocalyptic number.

20399343 is a deficient number, since it is larger than the sum of its proper divisors (6799785).

20399343 is an equidigital number, since it uses as much as digits as its factorization.

20399343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799784.

The product of its (nonzero) digits is 17496, while the sum is 33.

The square root of 20399343 is about 4516.5631845464. The cubic root of 20399343 is about 273.2365082722.

The spelling of 20399343 in words is "twenty million, three hundred ninety-nine thousand, three hundred forty-three".