20235509 has 8 divisors (see below), whose sum is σ = 23690688. Its totient is φ = 16921440.

The previous prime is 20235493. The next prime is 20235511. The reversal of 20235509 is 90553202.

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 20235509 - 2⁴ = 20235493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235599) 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 7 ways as a sum of consecutive naturals, for example, 34967 + ... + 35540.

It is an arithmetic number, because the mean of its divisors is an integer number (2961336).

Almost surely, 2^20235509 is an apocalyptic number.

It is an amenable number.

20235509 is a deficient number, since it is larger than the sum of its proper divisors (3455179).

20235509 is an equidigital number, since it uses as much as digits as its factorization.

20235509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70555.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 20235509 is about 4498.3896007349. The cubic root of 20235509 is about 272.5030563863.

The spelling of 20235509 in words is "twenty million, two hundred thirty-five thousand, five hundred nine".