20313647 has 2 divisors, whose sum is σ = 20313648. Its totient is φ = 20313646.

The previous prime is 20313619. The next prime is 20313653. The reversal of 20313647 is 74631302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20313647 - 2⁶ = 20313583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156823 + 10156824.

It is an arithmetic number, because the mean of its divisors is an integer number (10156824).

Almost surely, 2^20313647 is an apocalyptic number.

20313647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313647 is an equidigital number, since it uses as much as digits as its factorization.

20313647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 20313647 is about 4507.0663407587. The cubic root of 20313647 is about 272.8533563717.

Adding to 20313647 its reverse (74631302), we get a palindrome (94944949).

The spelling of 20313647 in words is "twenty million, three hundred thirteen thousand, six hundred forty-seven".