20866902 has 64 divisors (see below), whose sum is σ = 50995200. Its totient is φ = 5559840.

The previous prime is 20866897. The next prime is 20866907. The reversal of 20866902 is 20966802.

It is an interprime number because it is at equal distance from previous prime (20866897) and next prime (20866907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62877 + ... + 63207.

It is an arithmetic number, because the mean of its divisors is an integer number (796800).

Almost surely, 2^20866902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20866902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25497600).

20866902 is an abundant number, since it is smaller than the sum of its proper divisors (30128298).

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

20866902 is a wasteful number, since it uses less digits than its factorization.

20866902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20866902 is about 4568.0304289705. The cubic root of 20866902 is about 275.3083131621.

The spelling of 20866902 in words is "twenty million, eight hundred sixty-six thousand, nine hundred two".