20881255 has 8 divisors (see below), whose sum is σ = 25088400. Its totient is φ = 16684416.

The previous prime is 20881241. The next prime is 20881271. The reversal of 20881255 is 55218802.

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 20881255 - 2¹³ = 20873063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2976 + ... + 7114.

It is an arithmetic number, because the mean of its divisors is an integer number (3136050).

Almost surely, 2^20881255 is an apocalyptic number.

20881255 is a deficient number, since it is larger than the sum of its proper divisors (4207145).

20881255 is a wasteful number, since it uses less digits than its factorization.

20881255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 20881255 is about 4569.6011860993. The cubic root of 20881255 is about 275.3714209899.

The spelling of 20881255 in words is "twenty million, eight hundred eighty-one thousand, two hundred fifty-five".