20865938 has 8 divisors (see below), whose sum is σ = 31320432. Its totient is φ = 10425796.

The previous prime is 20865937. The next prime is 20865967. The reversal of 20865938 is 83956802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20865895 and 20865904.

It is not an unprimeable number, because it can be changed into a prime (20865931) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1481 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (3915054).

Almost surely, 2^20865938 is an apocalyptic number.

20865938 is a deficient number, since it is larger than the sum of its proper divisors (10454494).

20865938 is a wasteful number, since it uses less digits than its factorization.

20865938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 20865938 is about 4567.9249118172. The cubic root of 20865938 is about 275.3040735726.

The spelling of 20865938 in words is "twenty million, eight hundred sixty-five thousand, nine hundred thirty-eight".