20726497089 has 27 divisors (see below), whose sum is σ = 30793026537. Its totient is φ = 13433848704.

The previous prime is 20726497067. The next prime is 20726497091. The reversal of 20726497089 is 98079462702.

The square root of 20726497089 is 143967.

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

20726497089 is a `hidden beast` number, since 2 + 0 + 72 + 6 + 497 + 0 + 89 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17791024689 + 2935472400 = 133383^2 + 54180^2 .

It is not a de Polignac number, because 20726497089 - 2³¹ = 18579013441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20726497009) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15979689 + ... + 15980985.

Almost surely, 2^20726497089 is an apocalyptic number.

20726497089 is the 143967-th square number.

20726497089 is the 71984-th centered octagonal number.

It is an amenable number.

20726497089 is a deficient number, since it is larger than the sum of its proper divisors (10066529448).

20726497089 is an frugal number, since it uses more digits than its factorization.

20726497089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 20726497089 in words is "twenty billion, seven hundred twenty-six million, four hundred ninety-seven thousand, eighty-nine".