20806838 has 16 divisors (see below), whose sum is σ = 33746496. Its totient is φ = 9564480.

The previous prime is 20806829. The next prime is 20806847. The reversal of 20806838 is 83860802.

It is an interprime number because it is at equal distance from previous prime (20806829) and next prime (20806847).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20806798 and 20806807.

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, 5570 + ... + 8522.

It is an arithmetic number, because the mean of its divisors is an integer number (2109156).

Almost surely, 2^20806838 is an apocalyptic number.

20806838 is a deficient number, since it is larger than the sum of its proper divisors (12939658).

20806838 is a wasteful number, since it uses less digits than its factorization.

20806838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20806838 is about 4561.4513041356. The cubic root of 20806838 is about 275.0439070389.

The spelling of 20806838 in words is "twenty million, eight hundred six thousand, eight hundred thirty-eight".