20958868 has 36 divisors (see below), whose sum is σ = 43390452. Its totient is φ = 8830080.

The previous prime is 20958863. The next prime is 20958907. The reversal of 20958868 is 86885902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 20322064 = 798^2 + 4508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11080 + ... + 12832.

Almost surely, 2^20958868 is an apocalyptic number.

20958868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20958868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21695226).

20958868 is an abundant number, since it is smaller than the sum of its proper divisors (22431584).

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

20958868 is a wasteful number, since it uses less digits than its factorization.

20958868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1823 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 20958868 is about 4578.0856261105. The cubic root of 20958868 is about 275.7121728130.

The spelling of 20958868 in words is "twenty million, nine hundred fifty-eight thousand, eight hundred sixty-eight".