20405250554419 has 2 divisors, whose sum is σ = 20405250554420. Its totient is φ = 20405250554418.

The previous prime is 20405250554417. The next prime is 20405250554459. The reversal of 20405250554419 is 91445505250402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20405250554419 - 2¹ = 20405250554417 is a prime.

It is a super-3 number, since 3×20405250554419³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 20405250554417, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20405250554417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202625277209 + 10202625277210.

It is an arithmetic number, because the mean of its divisors is an integer number (10202625277210).

Almost surely, 2^{20405250554419} is an apocalyptic number.

20405250554419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405250554419 is an equidigital number, since it uses as much as digits as its factorization.

20405250554419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 20405250554419 in words is "twenty trillion, four hundred five billion, two hundred fifty million, five hundred fifty-four thousand, four hundred nineteen".