20806244 has 12 divisors (see below), whose sum is σ = 36615600. Its totient is φ = 10344648.

The previous prime is 20806243. The next prime is 20806259. The reversal of 20806244 is 44260802.

It is not an unprimeable number, because it can be changed into a prime (20806243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13814 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (3051300).

Almost surely, 2^20806244 is an apocalyptic number.

It is an amenable number.

20806244 is a deficient number, since it is larger than the sum of its proper divisors (15809356).

20806244 is a wasteful number, since it uses less digits than its factorization.

20806244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29242 (or 29240 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 20806244 is about 4561.3861928146. The cubic root of 20806244 is about 275.0412896681.

The spelling of 20806244 in words is "twenty million, eight hundred six thousand, two hundred forty-four".