20268551 has 4 divisors (see below), whose sum is σ = 20277600. Its totient is φ = 20259504.

The previous prime is 20268527. The next prime is 20268557. The reversal of 20268551 is 15586202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20268551 - 2⁶ = 20268487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20268557) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1595 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (5069400).

Almost surely, 2^20268551 is an apocalyptic number.

20268551 is a deficient number, since it is larger than the sum of its proper divisors (9049).

20268551 is an equidigital number, since it uses as much as digits as its factorization.

20268551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 20268551 is about 4502.0607503675. The cubic root of 20268551 is about 272.6512966178.

The spelling of 20268551 in words is "twenty million, two hundred sixty-eight thousand, five hundred fifty-one".