20663147 has 2 divisors, whose sum is σ = 20663148. Its totient is φ = 20663146.

The previous prime is 20663107. The next prime is 20663173. The reversal of 20663147 is 74136602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20663147 - 2⁸ = 20662891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20663107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331573 + 10331574.

It is an arithmetic number, because the mean of its divisors is an integer number (10331574).

Almost surely, 2^20663147 is an apocalyptic number.

20663147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663147 is an equidigital number, since it uses as much as digits as its factorization.

20663147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20663147 is about 4545.6734374568. The cubic root of 20663147 is about 274.4092973628.

Adding to 20663147 its reverse (74136602), we get a palindrome (94799749).

The spelling of 20663147 in words is "twenty million, six hundred sixty-three thousand, one hundred forty-seven".