20912089 has 8 divisors (see below), whose sum is σ = 22849632. Its totient is φ = 18980640.

The previous prime is 20912071. The next prime is 20912113. The reversal of 20912089 is 98021902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20912089 - 2¹⁵ = 20879321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20912089.

It is not an unprimeable number, because it can be changed into a prime (20912029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8637 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (2856204).

Almost surely, 2^20912089 is an apocalyptic number.

It is an amenable number.

20912089 is a deficient number, since it is larger than the sum of its proper divisors (1937543).

20912089 is a wasteful number, since it uses less digits than its factorization.

20912089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 20912089 is about 4572.9737589450. The cubic root of 20912089 is about 275.5068953910.

The spelling of 20912089 in words is "twenty million, nine hundred twelve thousand, eighty-nine".