20500406 has 16 divisors (see below), whose sum is σ = 32331744. Its totient is φ = 9729984.

The previous prime is 20500397. The next prime is 20500423. The reversal of 20500406 is 60400502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4676 + ... + 7928.

It is an arithmetic number, because the mean of its divisors is an integer number (2020734).

Almost surely, 2^20500406 is an apocalyptic number.

20500406 is a deficient number, since it is larger than the sum of its proper divisors (11831338).

20500406 is a wasteful number, since it uses less digits than its factorization.

20500406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20500406 is about 4527.7374040463. The cubic root of 20500406 is about 273.6869904952.

Adding to 20500406 its reverse (60400502), we get a palindrome (80900908).

The spelling of 20500406 in words is "twenty million, five hundred thousand, four hundred six".