20259959 has 4 divisors (see below), whose sum is σ = 20273304. Its totient is φ = 20246616.

The previous prime is 20259949. The next prime is 20259973. The reversal of 20259959 is 95995202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20259959 - 2²⁰ = 19211383 is a prime.

It is a super-3 number, since 3×20259959³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4052 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (5068326).

Almost surely, 2^20259959 is an apocalyptic number.

20259959 is a deficient number, since it is larger than the sum of its proper divisors (13345).

20259959 is a wasteful number, since it uses less digits than its factorization.

20259959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 20259959 is about 4501.1064195373. The cubic root of 20259959 is about 272.6127648214.

The spelling of 20259959 in words is "twenty million, two hundred fifty-nine thousand, nine hundred fifty-nine".