20317967 has 2 divisors, whose sum is σ = 20317968. Its totient is φ = 20317966.

The previous prime is 20317963. The next prime is 20317981. The reversal of 20317967 is 76971302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20317967 - 2² = 20317963 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20317963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158983 + 10158984.

It is an arithmetic number, because the mean of its divisors is an integer number (10158984).

Almost surely, 2^20317967 is an apocalyptic number.

20317967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317967 is an equidigital number, since it uses as much as digits as its factorization.

20317967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20317967 is about 4507.5455627204. The cubic root of 20317967 is about 272.8726971127.

The spelling of 20317967 in words is "twenty million, three hundred seventeen thousand, nine hundred sixty-seven".