20308402 has 16 divisors (see below), whose sum is σ = 32011200. Its totient is φ = 9644272.

The previous prime is 20308367. The next prime is 20308411. The reversal of 20308402 is 20480302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20308402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5373 + ... + 8335.

It is an arithmetic number, because the mean of its divisors is an integer number (2000700).

Almost surely, 2^20308402 is an apocalyptic number.

20308402 is a deficient number, since it is larger than the sum of its proper divisors (11702798).

20308402 is a wasteful number, since it uses less digits than its factorization.

20308402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20308402 is about 4506.4844391166. The cubic root of 20308402 is about 272.8298706982.

Adding to 20308402 its reverse (20480302), we get a palindrome (40788704).

The spelling of 20308402 in words is "twenty million, three hundred eight thousand, four hundred two".