20302643 has 2 divisors, whose sum is σ = 20302644. Its totient is φ = 20302642.

The previous prime is 20302627. The next prime is 20302649. The reversal of 20302643 is 34620302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20302643 - 2⁴ = 20302627 is a prime.

It is not a weakly prime, because it can be changed into another prime (20302649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151321 + 10151322.

It is an arithmetic number, because the mean of its divisors is an integer number (10151322).

Almost surely, 2^20302643 is an apocalyptic number.

20302643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20302643 is an equidigital number, since it uses as much as digits as its factorization.

20302643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20302643 is about 4505.8454256665. The cubic root of 20302643 is about 272.8040788155.

Adding to 20302643 its reverse (34620302), we get a palindrome (54922945).

The spelling of 20302643 in words is "twenty million, three hundred two thousand, six hundred forty-three".