20129047 has 2 divisors, whose sum is σ = 20129048. Its totient is φ = 20129046.

The previous prime is 20129023. The next prime is 20129059. The reversal of 20129047 is 74092102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20129047 - 2¹⁹ = 19604759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064523 + 10064524.

It is an arithmetic number, because the mean of its divisors is an integer number (10064524).

Almost surely, 2^20129047 is an apocalyptic number.

20129047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129047 is an equidigital number, since it uses as much as digits as its factorization.

20129047 is an evil number, because the sum of its binary digits is even.

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

The square root of 20129047 is about 4486.5406495428. The cubic root of 20129047 is about 272.0243229042.

The spelling of 20129047 in words is "twenty million, one hundred twenty-nine thousand, forty-seven".