20880409 has 8 divisors (see below), whose sum is σ = 23091552. Its totient is φ = 18721440.

The previous prime is 20880407. The next prime is 20880443. The reversal of 20880409 is 90408802.

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 20880409 - 2¹ = 20880407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20880407) 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, 12199 + ... + 13804.

It is an arithmetic number, because the mean of its divisors is an integer number (2886444).

Almost surely, 2^20880409 is an apocalyptic number.

It is an amenable number.

20880409 is a deficient number, since it is larger than the sum of its proper divisors (2211143).

20880409 is a wasteful number, since it uses less digits than its factorization.

20880409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26087.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20880409 is about 4569.5086169084. The cubic root of 20880409 is about 275.3677020664.

The spelling of 20880409 in words is "twenty million, eight hundred eighty thousand, four hundred nine".