20395889 has 8 divisors (see below), whose sum is σ = 20947872. Its totient is φ = 19847520.

The previous prime is 20395883. The next prime is 20395891. The reversal of 20395889 is 98859302.

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 20395889 - 2⁸ = 20395633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20395883) 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, 13517 + ... + 14949.

It is an arithmetic number, because the mean of its divisors is an integer number (2618484).

Almost surely, 2^20395889 is an apocalyptic number.

It is an amenable number.

20395889 is a deficient number, since it is larger than the sum of its proper divisors (551983).

20395889 is a wasteful number, since it uses less digits than its factorization.

20395889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 20395889 is about 4516.1807979752. The cubic root of 20395889 is about 273.2210860080.

The spelling of 20395889 in words is "twenty million, three hundred ninety-five thousand, eight hundred eighty-nine".