20268521 has 8 divisors (see below), whose sum is σ = 24945984. Its totient is φ = 16036560.

The previous prime is 20268511. The next prime is 20268527. The reversal of 20268521 is 12586202.

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 20268521 - 2¹⁴ = 20252137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20268527) 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, 111275 + ... + 111456.

It is an arithmetic number, because the mean of its divisors is an integer number (3118248).

Almost surely, 2^20268521 is an apocalyptic number.

It is an amenable number.

20268521 is a deficient number, since it is larger than the sum of its proper divisors (4677463).

20268521 is a wasteful number, since it uses less digits than its factorization.

20268521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222751.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20268521 is about 4502.0574185588. The cubic root of 20268521 is about 272.6511620983.

The spelling of 20268521 in words is "twenty million, two hundred sixty-eight thousand, five hundred twenty-one".