20881920346519 has 2 divisors, whose sum is σ = 20881920346520. Its totient is φ = 20881920346518.

The previous prime is 20881920346517. The next prime is 20881920346579. The reversal of 20881920346519 is 91564302918802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20881920346519 - 2¹ = 20881920346517 is a prime.

It is a super-2 number, since 2×20881920346519² (a number of 27 digits) contains 22 as substring.

Together with 20881920346517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20881920346517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440960173259 + 10440960173260.

It is an arithmetic number, because the mean of its divisors is an integer number (10440960173260).

Almost surely, 2^{20881920346519} is an apocalyptic number.

20881920346519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20881920346519 is an equidigital number, since it uses as much as digits as its factorization.

20881920346519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 20881920346519 in words is "twenty trillion, eight hundred eighty-one billion, nine hundred twenty million, three hundred forty-six thousand, five hundred nineteen".