20317963 has 2 divisors, whose sum is σ = 20317964. Its totient is φ = 20317962.

The previous prime is 20317949. The next prime is 20317967. The reversal of 20317963 is 36971302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20317963 - 2¹³ = 20309771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20317967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158981 + 10158982.

It is an arithmetic number, because the mean of its divisors is an integer number (10158982).

Almost surely, 2^20317963 is an apocalyptic number.

20317963 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317963 is an equidigital number, since it uses as much as digits as its factorization.

20317963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20317963 is about 4507.5451190199. The cubic root of 20317963 is about 272.8726792058.

The spelling of 20317963 in words is "twenty million, three hundred seventeen thousand, nine hundred sixty-three".