20065406 has 32 divisors (see below), whose sum is σ = 34020000. Its totient is φ = 8819712.

The previous prime is 20065399. The next prime is 20065417. The reversal of 20065406 is 60456002.

It is a Curzon number.

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, 57320 + ... + 57668.

It is an arithmetic number, because the mean of its divisors is an integer number (1063125).

Almost surely, 2^20065406 is an apocalyptic number.

20065406 is a deficient number, since it is larger than the sum of its proper divisors (13954594).

20065406 is a wasteful number, since it uses less digits than its factorization.

20065406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20065406 is about 4479.4425992527. The cubic root of 20065406 is about 271.7373383495.

The spelling of 20065406 in words is "twenty million, sixty-five thousand, four hundred six".