20399333 has 4 divisors (see below), whose sum is σ = 21057408. Its totient is φ = 19741260.

The previous prime is 20399299. The next prime is 20399341. The reversal of 20399333 is 33399302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20399333 is a prime.

It is a super-2 number, since 2×20399333² = 832265573689778, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20399333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328991 + ... + 329052.

It is an arithmetic number, because the mean of its divisors is an integer number (5264352).

Almost surely, 2^20399333 is an apocalyptic number.

It is an amenable number.

20399333 is a deficient number, since it is larger than the sum of its proper divisors (658075).

20399333 is an equidigital number, since it uses as much as digits as its factorization.

20399333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658074.

The product of its (nonzero) digits is 13122, while the sum is 32.

The square root of 20399333 is about 4516.5620775098. The cubic root of 20399333 is about 273.2364636243.

The spelling of 20399333 in words is "twenty million, three hundred ninety-nine thousand, three hundred thirty-three".