20402384 has 20 divisors (see below), whose sum is σ = 39777216. Its totient is φ = 10137312.

The previous prime is 20402383. The next prime is 20402387. The reversal of 20402384 is 48320402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402381) 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 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 6519.

Almost surely, 2^20402384 is an apocalyptic number.

It is an amenable number.

20402384 is a deficient number, since it is larger than the sum of its proper divisors (19374832).

20402384 is a wasteful number, since it uses less digits than its factorization.

20402384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7994 (or 7988 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20402384 is about 4516.8998217804. The cubic root of 20402384 is about 273.2500850319.

Adding to 20402384 its reverse (48320402), we get a palindrome (68722786).

The spelling of 20402384 in words is "twenty million, four hundred two thousand, three hundred eighty-four".