20415516442291 has 2 divisors, whose sum is σ = 20415516442292. Its totient is φ = 20415516442290.

The previous prime is 20415516442273. The next prime is 20415516442339. The reversal of 20415516442291 is 19224461551402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20415516442291 - 2⁵ = 20415516442259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20415516442241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207758221145 + 10207758221146.

It is an arithmetic number, because the mean of its divisors is an integer number (10207758221146).

Almost surely, 2^{20415516442291} is an apocalyptic number.

20415516442291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415516442291 is an equidigital number, since it uses as much as digits as its factorization.

20415516442291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 46.

Adding to 20415516442291 its reverse (19224461551402), we get a palindrome (39639977993693).

The spelling of 20415516442291 in words is "twenty trillion, four hundred fifteen billion, five hundred sixteen million, four hundred forty-two thousand, two hundred ninety-one".