20126245689 has 45 divisors (see below), whose sum is σ = 33069875839. Its totient is φ = 12189212640.

The previous prime is 20126245669. The next prime is 20126245759. The reversal of 20126245689 is 98654262102.

The square root of 20126245689 is 141867.

It is a perfect power (a square), and thus also a powerful number.

20126245689 is a `hidden beast` number, since 2 + 0 + 12 + 624 + 5 + 6 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16691348025 + 3434897664 = 129195^2 + 58608^2 .

It is not a de Polignac number, because 20126245689 - 2⁷ = 20126245561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20126245609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 14044117 + ... + 14045549.

Almost surely, 2^20126245689 is an apocalyptic number.

20126245689 is the 141867-th square number.

20126245689 is the 70934-th centered octagonal number.

It is an amenable number.

20126245689 is a deficient number, since it is larger than the sum of its proper divisors (12943630150).

20126245689 is an frugal number, since it uses more digits than its factorization.

20126245689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20126245689 in words is "twenty billion, one hundred twenty-six million, two hundred forty-five thousand, six hundred eighty-nine".