20863806 has 32 divisors (see below), whose sum is σ = 44955648. Its totient is φ = 6436320.

The previous prime is 20863781. The next prime is 20863813. The reversal of 20863806 is 60836802.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1840 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (1404864).

Almost surely, 2^20863806 is an apocalyptic number.

20863806 is an abundant number, since it is smaller than the sum of its proper divisors (24091842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20863806 is a wasteful number, since it uses less digits than its factorization.

20863806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20863806 is about 4567.6915394978. The cubic root of 20863806 is about 275.2946967551.

The spelling of 20863806 in words is "twenty million, eight hundred sixty-three thousand, eight hundred six".