20320402 has 8 divisors (see below), whose sum is σ = 30502476. Its totient is φ = 10152912.

The previous prime is 20320373. The next prime is 20320409. The reversal of 20320402 is 20402302.

It can be written as a sum of positive squares in 2 ways, for example, as 20169081 + 151321 = 4491^2 + 389^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20320409) 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, 1048 + ... + 6460.

Almost surely, 2^20320402 is an apocalyptic number.

20320402 is a deficient number, since it is larger than the sum of its proper divisors (10182074).

20320402 is a wasteful number, since it uses less digits than its factorization.

20320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20320402 is about 4507.8156572779. The cubic root of 20320402 is about 272.8835974564.

Adding to 20320402 its reverse (20402302), we get a palindrome (40722704).

The spelling of 20320402 in words is "twenty million, three hundred twenty thousand, four hundred two".