20258185505247 has 16 divisors (see below), whose sum is σ = 30013125256960. Its totient is φ = 13505007641400.

The previous prime is 20258185505237. The next prime is 20258185505267. The reversal of 20258185505247 is 74250558185202.

20258185505247 is a `hidden beast` number, since 2 + 0 + 2 + 5 + 81 + 8 + 550 + 5 + 2 + 4 + 7 = 666.

It is not a de Polignac number, because 20258185505247 - 2¹⁹ = 20258184980959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20258185505193 and 20258185505202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20258185505227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11654779 + ... + 13279692.

It is an arithmetic number, because the mean of its divisors is an integer number (1875820328560).

Almost surely, 2^{20258185505247} is an apocalyptic number.

20258185505247 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20258185505247 is a deficient number, since it is larger than the sum of its proper divisors (9754939751713).

20258185505247 is a wasteful number, since it uses less digits than its factorization.

20258185505247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24964571 (or 24964565 counting only the distinct ones).

The product of its (nonzero) digits is 8960000, while the sum is 54.

The spelling of 20258185505247 in words is "twenty trillion, two hundred fifty-eight billion, one hundred eighty-five million, five hundred five thousand, two hundred forty-seven".