20402313 has 8 divisors (see below), whose sum is σ = 27531168. Its totient is φ = 13437504.

The previous prime is 20402287. The next prime is 20402321. The reversal of 20402313 is 31320402.

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

It is a de Polignac number, because none of the positive numbers 2^k-20402313 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20402292 and 20402301.

It is not an unprimeable number, because it can be changed into a prime (20402383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40720 + ... + 41217.

It is an arithmetic number, because the mean of its divisors is an integer number (3441396).

Almost surely, 2^20402313 is an apocalyptic number.

It is an amenable number.

20402313 is a deficient number, since it is larger than the sum of its proper divisors (7128855).

20402313 is an equidigital number, since it uses as much as digits as its factorization.

20402313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82023.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20402313 is about 4516.8919624007. The cubic root of 20402313 is about 273.2497680628.

Adding to 20402313 its reverse (31320402), we get a palindrome (51722715).

The spelling of 20402313 in words is "twenty million, four hundred two thousand, three hundred thirteen".