20359989 has 12 divisors (see below), whose sum is σ = 31671276. Its totient is φ = 12529152.

The previous prime is 20359987. The next prime is 20359993. The reversal of 20359989 is 98995302.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 7700625 = 3558^2 + 2775^2 .

It is not a de Polignac number, because 20359989 - 2¹ = 20359987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20359987) 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, 86892 + ... + 87125.

It is an arithmetic number, because the mean of its divisors is an integer number (2639273).

Almost surely, 2^20359989 is an apocalyptic number.

It is an amenable number.

20359989 is a deficient number, since it is larger than the sum of its proper divisors (11311287).

20359989 is a wasteful number, since it uses less digits than its factorization.

20359989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174036 (or 174033 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 20359989 is about 4512.2044501552. The cubic root of 20359989 is about 273.0606877117.

The spelling of 20359989 in words is "twenty million, three hundred fifty-nine thousand, nine hundred eighty-nine".