20389086 has 48 divisors (see below), whose sum is σ = 48825504. Its totient is φ = 6116352.

The previous prime is 20389081. The next prime is 20389087. The reversal of 20389086 is 68098302.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20389086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5590 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (1017198).

Almost surely, 2^20389086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20389086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24412752).

20389086 is an abundant number, since it is smaller than the sum of its proper divisors (28436418).

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

20389086 is a wasteful number, since it uses less digits than its factorization.

20389086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945 (or 2942 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20389086 is about 4515.4275545069. The cubic root of 20389086 is about 273.1907052167.

The spelling of 20389086 in words is "twenty million, three hundred eighty-nine thousand, eighty-six".