20354509 has 8 divisors (see below), whose sum is σ = 23289920. Its totient is φ = 17426016.

The previous prime is 20354497. The next prime is 20354513. The reversal of 20354509 is 90545302.

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 20354509 - 2⁷ = 20354381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354519) 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, 9217 + ... + 11209.

It is an arithmetic number, because the mean of its divisors is an integer number (2911240).

Almost surely, 2^20354509 is an apocalyptic number.

It is an amenable number.

20354509 is a deficient number, since it is larger than the sum of its proper divisors (2935411).

20354509 is a wasteful number, since it uses less digits than its factorization.

20354509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20354509 is about 4511.5971673012. The cubic root of 20354509 is about 273.0361869316.

The spelling of 20354509 in words is "twenty million, three hundred fifty-four thousand, five hundred nine".