20347633 has 2 divisors, whose sum is σ = 20347634. Its totient is φ = 20347632.

The previous prime is 20347631. The next prime is 20347661. The reversal of 20347633 is 33674302.

It is an a-pointer prime, because the next prime (20347661) can be obtained adding 20347633 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11209104 + 9138529 = 3348^2 + 3023^2 .

It is a cyclic number.

It is not a de Polignac number, because 20347633 - 2¹ = 20347631 is a prime.

Together with 20347631, it forms a pair of twin primes.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (20347631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173816 + 10173817.

It is an arithmetic number, because the mean of its divisors is an integer number (10173817).

Almost surely, 2^20347633 is an apocalyptic number.

It is an amenable number.

20347633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347633 is an equidigital number, since it uses as much as digits as its factorization.

20347633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 28.

The square root of 20347633 is about 4510.8350668141. The cubic root of 20347633 is about 273.0054384905.

The spelling of 20347633 in words is "twenty million, three hundred forty-seven thousand, six hundred thirty-three".