20729227 has 2 divisors, whose sum is σ = 20729228. Its totient is φ = 20729226.

The previous prime is 20729221. The next prime is 20729243. The reversal of 20729227 is 72292702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20729227 - 2⁷ = 20729099 is a prime.

It is not a weakly prime, because it can be changed into another prime (20729221) 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 as a sum of consecutive naturals, namely, 10364613 + 10364614.

It is an arithmetic number, because the mean of its divisors is an integer number (10364614).

Almost surely, 2^20729227 is an apocalyptic number.

20729227 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729227 is an equidigital number, since it uses as much as digits as its factorization.

20729227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20729227 is about 4552.9360856485. The cubic root of 20729227 is about 274.7015031130.

The spelling of 20729227 in words is "twenty million, seven hundred twenty-nine thousand, two hundred twenty-seven".