20506221319 has 2 divisors, whose sum is σ = 20506221320. Its totient is φ = 20506221318.

The previous prime is 20506221247. The next prime is 20506221331. The reversal of 20506221319 is 91312260502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20506221319 - 2¹⁵ = 20506188551 is a prime.

It is a super-2 number, since 2×20506221319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20506221419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253110659 + 10253110660.

It is an arithmetic number, because the mean of its divisors is an integer number (10253110660).

Almost surely, 2^20506221319 is an apocalyptic number.

20506221319 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506221319 is an equidigital number, since it uses as much as digits as its factorization.

20506221319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 20506221319 in words is "twenty billion, five hundred six million, two hundred twenty-one thousand, three hundred nineteen".