20332643 has 2 divisors, whose sum is σ = 20332644. Its totient is φ = 20332642.

The previous prime is 20332633. The next prime is 20332651. The reversal of 20332643 is 34623302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20332643 - 2⁶ = 20332579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20332633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166321 + 10166322.

It is an arithmetic number, because the mean of its divisors is an integer number (10166322).

Almost surely, 2^20332643 is an apocalyptic number.

20332643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20332643 is an equidigital number, since it uses as much as digits as its factorization.

20332643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 23.

The square root of 20332643 is about 4509.1732058106. The cubic root of 20332643 is about 272.9383814382.

Adding to 20332643 its reverse (34623302), we get a palindrome (54955945).

The spelling of 20332643 in words is "twenty million, three hundred thirty-two thousand, six hundred forty-three".