20105030477249 has 2 divisors, whose sum is σ = 20105030477250. Its totient is φ = 20105030477248.

The previous prime is 20105030477243. The next prime is 20105030477281. The reversal of 20105030477249 is 94277403050102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12787096569025 + 7317933908224 = 3575905^2 + 2705168^2 .

It is a cyclic number.

It is not a de Polignac number, because 20105030477249 - 2²⁴ = 20105013700033 is a prime.

It is a super-2 number, since 2×20105030477249² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20105030477243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052515238624 + 10052515238625.

It is an arithmetic number, because the mean of its divisors is an integer number (10052515238625).

Almost surely, 2^{20105030477249} is an apocalyptic number.

It is an amenable number.

20105030477249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105030477249 is an equidigital number, since it uses as much as digits as its factorization.

20105030477249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 20105030477249 in words is "twenty trillion, one hundred five billion, thirty million, four hundred seventy-seven thousand, two hundred forty-nine".