20409359 has 8 divisors (see below), whose sum is σ = 21166320. Its totient is φ = 19656000.

The previous prime is 20409353. The next prime is 20409371. The reversal of 20409359 is 95390402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20409359 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 (20409353) 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, 16844 + ... + 18014.

It is an arithmetic number, because the mean of its divisors is an integer number (2645790).

Almost surely, 2^20409359 is an apocalyptic number.

20409359 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20409359 is a deficient number, since it is larger than the sum of its proper divisors (756961).

20409359 is a wasteful number, since it uses less digits than its factorization.

20409359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20409359 is about 4517.6718561666. The cubic root of 20409359 is about 273.2812203181.

The spelling of 20409359 in words is "twenty million, four hundred nine thousand, three hundred fifty-nine".