20129227 has 4 divisors (see below), whose sum is σ = 21188680. Its totient is φ = 19069776.

The previous prime is 20129167. The next prime is 20129251. The reversal of 20129227 is 72292102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20129227 - 2¹⁵ = 20096459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20129257) 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 3 ways as a sum of consecutive naturals, for example, 529698 + ... + 529735.

It is an arithmetic number, because the mean of its divisors is an integer number (5297170).

Almost surely, 2^20129227 is an apocalyptic number.

20129227 is a deficient number, since it is larger than the sum of its proper divisors (1059453).

20129227 is a wasteful number, since it uses less digits than its factorization.

20129227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059452.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20129227 is about 4486.5607094968. The cubic root of 20129227 is about 272.0251337429.

The spelling of 20129227 in words is "twenty million, one hundred twenty-nine thousand, two hundred twenty-seven".