20880643 has 8 divisors (see below), whose sum is σ = 24371712. Its totient is φ = 17516616.

The previous prime is 20880637. The next prime is 20880647. The reversal of 20880643 is 34608802.

It is a happy number.

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 20880643 - 2²¹ = 18783491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20880647) 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, 31405 + ... + 32062.

It is an arithmetic number, because the mean of its divisors is an integer number (3046464).

Almost surely, 2^20880643 is an apocalyptic number.

20880643 is a deficient number, since it is larger than the sum of its proper divisors (3491069).

20880643 is an equidigital number, since it uses as much as digits as its factorization.

20880643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63521.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20880643 is about 4569.5342213403. The cubic root of 20880643 is about 275.3687307149.

It can be divided in two parts, 208806 and 43, that added together give a square (208849 = 457²).

The spelling of 20880643 in words is "twenty million, eight hundred eighty thousand, six hundred forty-three".