20268189 has 12 divisors (see below), whose sum is σ = 29501472. Its totient is φ = 13408200.

The previous prime is 20268169. The next prime is 20268197. The reversal of 20268189 is 98186202.

It is not a de Polignac number, because 20268189 - 2¹⁵ = 20235421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20268169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7417 + ... + 9774.

It is an arithmetic number, because the mean of its divisors is an integer number (2458456).

Almost surely, 2^20268189 is an apocalyptic number.

It is an amenable number.

20268189 is a deficient number, since it is larger than the sum of its proper divisors (9233283).

20268189 is a wasteful number, since it uses less digits than its factorization.

20268189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17328 (or 17325 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 20268189 is about 4502.0205463769. The cubic root of 20268189 is about 272.6496734075.

The spelling of 20268189 in words is "twenty million, two hundred sixty-eight thousand, one hundred eighty-nine".