20880616180409 has 4 divisors (see below), whose sum is σ = 20880625330320. Its totient is φ = 20880607030500.

The previous prime is 20880616180337. The next prime is 20880616180451. The reversal of 20880616180409 is 90408161608802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20880616180409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20880616182409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1953422 + ... + 6751080.

It is an arithmetic number, because the mean of its divisors is an integer number (5220156332580).

Almost surely, 2^{20880616180409} is an apocalyptic number.

It is an amenable number.

20880616180409 is a deficient number, since it is larger than the sum of its proper divisors (9149911).

20880616180409 is an equidigital number, since it uses as much as digits as its factorization.

20880616180409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9149910.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 20880616180409 in words is "twenty trillion, eight hundred eighty billion, six hundred sixteen million, one hundred eighty thousand, four hundred nine".