20869866 has 32 divisors (see below), whose sum is σ = 48820800. Its totient is φ = 6590160.

The previous prime is 20869859. The next prime is 20869867. The reversal of 20869866 is 66896802.

It is not an unprimeable number, because it can be changed into a prime (20869867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9145 + ... + 11196.

It is an arithmetic number, because the mean of its divisors is an integer number (1525650).

Almost surely, 2^20869866 is an apocalyptic number.

20869866 is an abundant number, since it is smaller than the sum of its proper divisors (27950934).

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

20869866 is a wasteful number, since it uses less digits than its factorization.

20869866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20371 (or 20365 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 20869866 is about 4568.3548461125. The cubic root of 20869866 is about 275.3213477629.

The spelling of 20869866 in words is "twenty million, eight hundred sixty-nine thousand, eight hundred sixty-six".