20026509 has 8 divisors (see below), whose sum is σ = 27423840. Its totient is φ = 12990096.

The previous prime is 20026499. The next prime is 20026543. The reversal of 20026509 is 90562002.

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

It is not a de Polignac number, because 20026509 - 2²¹ = 17929357 is a prime.

It is a super-2 number, since 2×20026509² = 802122125454162, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20026009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90099 + ... + 90320.

It is an arithmetic number, because the mean of its divisors is an integer number (3427980).

Almost surely, 2^20026509 is an apocalyptic number.

It is an amenable number.

20026509 is a deficient number, since it is larger than the sum of its proper divisors (7397331).

20026509 is a wasteful number, since it uses less digits than its factorization.

20026509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180459.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20026509 is about 4475.0987698597. The cubic root of 20026509 is about 271.5616362068.

The spelling of 20026509 in words is "twenty million, twenty-six thousand, five hundred nine".