20491227 has 12 divisors (see below), whose sum is σ = 29816280. Its totient is φ = 13560288.

The previous prime is 20491223. The next prime is 20491243. The reversal of 20491227 is 72219402.

It is not a de Polignac number, because 20491227 - 2² = 20491223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20491227.

It is not an unprimeable number, because it can be changed into a prime (20491223) 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, 7077 + ... + 9542.

It is an arithmetic number, because the mean of its divisors is an integer number (2484690).

Almost surely, 2^20491227 is an apocalyptic number.

20491227 is a deficient number, since it is larger than the sum of its proper divisors (9325053).

20491227 is a wasteful number, since it uses less digits than its factorization.

20491227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16762 (or 16759 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20491227 is about 4526.7236496168. The cubic root of 20491227 is about 273.6461368666.

The spelling of 20491227 in words is "twenty million, four hundred ninety-one thousand, two hundred twenty-seven".