20506266419 has 2 divisors, whose sum is σ = 20506266420. Its totient is φ = 20506266418.

The previous prime is 20506266413. The next prime is 20506266437. The reversal of 20506266419 is 91466260502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20506266419 - 2⁸ = 20506266163 is a prime.

It is a super-2 number, since 2×20506266419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20506266413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253133209 + 10253133210.

It is an arithmetic number, because the mean of its divisors is an integer number (10253133210).

Almost surely, 2^20506266419 is an apocalyptic number.

20506266419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506266419 is an equidigital number, since it uses as much as digits as its factorization.

20506266419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20506266419 in words is "twenty billion, five hundred six million, two hundred sixty-six thousand, four hundred nineteen".