20129429 has 2 divisors, whose sum is σ = 20129430. Its totient is φ = 20129428.

The previous prime is 20129407. The next prime is 20129471. The reversal of 20129429 is 92492102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 6770404 = 3655^2 + 2602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20129429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20129129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064714 + 10064715.

It is an arithmetic number, because the mean of its divisors is an integer number (10064715).

Almost surely, 2^20129429 is an apocalyptic number.

It is an amenable number.

20129429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129429 is an equidigital number, since it uses as much as digits as its factorization.

20129429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20129429 is about 4486.5832211160. The cubic root of 20129429 is about 272.0260436784.

The spelling of 20129429 in words is "twenty million, one hundred twenty-nine thousand, four hundred twenty-nine".