20955889 has 8 divisors (see below), whose sum is σ = 21275648. Its totient is φ = 20638800.

The previous prime is 20955877. The next prime is 20955899. The reversal of 20955889 is 98855902.

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 20955889 - 2⁷ = 20955761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955839) 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, 19414 + ... + 20464.

It is an arithmetic number, because the mean of its divisors is an integer number (2659456).

Almost surely, 2^20955889 is an apocalyptic number.

It is an amenable number.

20955889 is a deficient number, since it is larger than the sum of its proper divisors (319759).

20955889 is a wasteful number, since it uses less digits than its factorization.

20955889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 20955889 is about 4577.7602602146. The cubic root of 20955889 is about 275.6991093613.

The spelling of 20955889 in words is "twenty million, nine hundred fifty-five thousand, eight hundred eighty-nine".