20225809 has 8 divisors (see below), whose sum is σ = 21150720. Its totient is φ = 19304736.

The previous prime is 20225783. The next prime is 20225813. The reversal of 20225809 is 90852202.

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 20225809 - 2⁹ = 20225297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20225819) 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, 18064 + ... + 19150.

It is an arithmetic number, because the mean of its divisors is an integer number (2643840).

Almost surely, 2^20225809 is an apocalyptic number.

It is an amenable number.

20225809 is a deficient number, since it is larger than the sum of its proper divisors (924911).

20225809 is a wasteful number, since it uses less digits than its factorization.

20225809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20225809 is about 4497.3113078816. The cubic root of 20225809 is about 272.4595074922.

It can be divided in two parts, 20225 and 809, that multiplied together give a square (16362025 = 4045²).

The spelling of 20225809 in words is "twenty million, two hundred twenty-five thousand, eight hundred nine".