20408406 has 32 divisors (see below), whose sum is σ = 43642368. Its totient is φ = 6346560.

The previous prime is 20408393. The next prime is 20408411. The reversal of 20408406 is 60480402.

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 15 ways as a sum of consecutive naturals, for example, 3855 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (1363824).

Almost surely, 2^20408406 is an apocalyptic number.

20408406 is an abundant number, since it is smaller than the sum of its proper divisors (23233962).

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

20408406 is a wasteful number, since it uses less digits than its factorization.

20408406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20408406 is about 4517.5663802539. The cubic root of 20408406 is about 273.2769666967.

Adding to 20408406 its reverse (60480402), we get a palindrome (80888808).

The spelling of 20408406 in words is "twenty million, four hundred eight thousand, four hundred six".