20881545 has 8 divisors (see below), whose sum is σ = 33410496. Its totient is φ = 11136816.

The previous prime is 20881529. The next prime is 20881561. The reversal of 20881545 is 54518802.

It is an interprime number because it is at equal distance from previous prime (20881529) and next prime (20881561).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20881545 - 2⁴ = 20881529 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696037 + ... + 696066.

It is an arithmetic number, because the mean of its divisors is an integer number (4176312).

Almost surely, 2^20881545 is an apocalyptic number.

It is an amenable number.

20881545 is a deficient number, since it is larger than the sum of its proper divisors (12528951).

20881545 is a wasteful number, since it uses less digits than its factorization.

20881545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392111.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 20881545 is about 4569.6329174235. The cubic root of 20881545 is about 275.3726957751.

The spelling of 20881545 in words is "twenty million, eight hundred eighty-one thousand, five hundred forty-five".