20522429 has 2 divisors, whose sum is σ = 20522430. Its totient is φ = 20522428.

The previous prime is 20522423. The next prime is 20522449. The reversal of 20522429 is 92422502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 182329 = 4510^2 + 427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20522429 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20522398 and 20522407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20522423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261214 + 10261215.

It is an arithmetic number, because the mean of its divisors is an integer number (10261215).

Almost surely, 2^20522429 is an apocalyptic number.

It is an amenable number.

20522429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20522429 is an equidigital number, since it uses as much as digits as its factorization.

20522429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20522429 is about 4530.1687606534. The cubic root of 20522429 is about 273.7849601244.

The spelling of 20522429 in words is "twenty million, five hundred twenty-two thousand, four hundred twenty-nine".