20315429 has 2 divisors, whose sum is σ = 20315430. Its totient is φ = 20315428.

The previous prime is 20315423. The next prime is 20315441. The reversal of 20315429 is 92451302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 4831204 = 3935^2 + 2198^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315429 - 2⁴ = 20315413 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 = 20315398 and 20315407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20315423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157714 + 10157715.

It is an arithmetic number, because the mean of its divisors is an integer number (10157715).

Almost surely, 2^20315429 is an apocalyptic number.

It is an amenable number.

20315429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315429 is an equidigital number, since it uses as much as digits as its factorization.

20315429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20315429 is about 4507.2640259918. The cubic root of 20315429 is about 272.8613347596.

The spelling of 20315429 in words is "twenty million, three hundred fifteen thousand, four hundred twenty-nine".