20960409 has 8 divisors (see below), whose sum is σ = 28019200. Its totient is φ = 13937616.

The previous prime is 20960377. The next prime is 20960413. The reversal of 20960409 is 90406902.

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

It is not a de Polignac number, because 20960409 - 2⁵ = 20960377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20960419) 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, 7609 + ... + 9990.

It is an arithmetic number, because the mean of its divisors is an integer number (3502400).

Almost surely, 2^20960409 is an apocalyptic number.

It is an amenable number.

20960409 is a deficient number, since it is larger than the sum of its proper divisors (7058791).

20960409 is a wasteful number, since it uses less digits than its factorization.

20960409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17999.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20960409 is about 4578.2539248058. The cubic root of 20960409 is about 275.7189298899.

The spelling of 20960409 in words is "twenty million, nine hundred sixty thousand, four hundred nine".