20195429 has 2 divisors, whose sum is σ = 20195430. Its totient is φ = 20195428.

The previous prime is 20195401. The next prime is 20195447. The reversal of 20195429 is 92459102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 8567329 = 3410^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 20195429 - 2¹² = 20191333 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 = 20195395 and 20195404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20195459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097714 + 10097715.

It is an arithmetic number, because the mean of its divisors is an integer number (10097715).

Almost surely, 2^20195429 is an apocalyptic number.

It is an amenable number.

20195429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195429 is an equidigital number, since it uses as much as digits as its factorization.

20195429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20195429 is about 4493.9324650021. The cubic root of 20195429 is about 272.3230239925.

The spelling of 20195429 in words is "twenty million, one hundred ninety-five thousand, four hundred twenty-nine".