20869893 has 40 divisors (see below), whose sum is σ = 34673760. Its totient is φ = 12402720.

The previous prime is 20869889. The next prime is 20869907. The reversal of 20869893 is 39896802.

It is not a de Polignac number, because 20869893 - 2² = 20869889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869873) 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 39 ways as a sum of consecutive naturals, for example, 52371 + ... + 52767.

It is an arithmetic number, because the mean of its divisors is an integer number (866844).

Almost surely, 2^20869893 is an apocalyptic number.

It is an amenable number.

20869893 is a deficient number, since it is larger than the sum of its proper divisors (13803867).

20869893 is a wasteful number, since it uses less digits than its factorization.

20869893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20869893 is about 4568.3578012235. The cubic root of 20869893 is about 275.3214664934.

The spelling of 20869893 in words is "twenty million, eight hundred sixty-nine thousand, eight hundred ninety-three".