20020243291 has 2 divisors, whose sum is σ = 20020243292. Its totient is φ = 20020243290.

The previous prime is 20020243289. The next prime is 20020243337. The reversal of 20020243291 is 19234202002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20020243291 - 2¹ = 20020243289 is a prime.

Together with 20020243289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20020243231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010121645 + 10010121646.

It is an arithmetic number, because the mean of its divisors is an integer number (10010121646).

Almost surely, 2^20020243291 is an apocalyptic number.

20020243291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020243291 is an equidigital number, since it uses as much as digits as its factorization.

20020243291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20020243291 its reverse (19234202002), we get a palindrome (39254445293).

The spelling of 20020243291 in words is "twenty billion, twenty million, two hundred forty-three thousand, two hundred ninety-one".