20865406 has 8 divisors (see below), whose sum is σ = 32026104. Its totient is φ = 10190040.

The previous prime is 20865391. The next prime is 20865461. The reversal of 20865406 is 60456802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121225 + ... + 121396.

It is an arithmetic number, because the mean of its divisors is an integer number (4003263).

Almost surely, 2^20865406 is an apocalyptic number.

20865406 is a deficient number, since it is larger than the sum of its proper divisors (11160698).

20865406 is a wasteful number, since it uses less digits than its factorization.

20865406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242666.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20865406 is about 4567.8666793154. The cubic root of 20865406 is about 275.3017338261.

The spelling of 20865406 in words is "twenty million, eight hundred sixty-five thousand, four hundred six".