20402396 has 24 divisors (see below), whose sum is σ = 41301120. Its totient is φ = 8637552.

The previous prime is 20402387. The next prime is 20402407. The reversal of 20402396 is 69320402.

It is a congruent number.

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, 2066 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (1720880).

Almost surely, 2^20402396 is an apocalyptic number.

It is an amenable number.

20402396 is an abundant number, since it is smaller than the sum of its proper divisors (20898724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20402396 is a wasteful number, since it uses less digits than its factorization.

20402396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8873 (or 8871 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20402396 is about 4516.9011501249. The cubic root of 20402396 is about 273.2501386041.

Adding to 20402396 its reverse (69320402), we get a palindrome (89722798).

The spelling of 20402396 in words is "twenty million, four hundred two thousand, three hundred ninety-six".