20506266423 has 20 divisors (see below), whose sum is σ = 31964682288. Its totient is φ = 13076458560.

The previous prime is 20506266419. The next prime is 20506266437. The reversal of 20506266423 is 32466260502.

20506266423 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 6 + 2 + 6 + 642 + 3 = 666.

It is not a de Polignac number, because 20506266423 - 2² = 20506266419 is a prime.

It is a super-2 number, since 2×20506266423² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506266413) 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 in 19 ways as a sum of consecutive naturals, for example, 5501698 + ... + 5505423.

Almost surely, 2^20506266423 is an apocalyptic number.

20506266423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20506266423 is a deficient number, since it is larger than the sum of its proper divisors (11458415865).

20506266423 is a wasteful number, since it uses less digits than its factorization.

20506266423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11007156 (or 11007147 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 20506266423 in words is "twenty billion, five hundred six million, two hundred sixty-six thousand, four hundred twenty-three".