20252763081 has 24 divisors (see below), whose sum is σ = 30800588000. Its totient is φ = 12788347392.

The previous prime is 20252763077. The next prime is 20252763133. The reversal of 20252763081 is 18036725202.

20252763081 is a `hidden beast` number, since 20 + 2 + 527 + 6 + 30 + 81 = 666.

It is not a de Polignac number, because 20252763081 - 2² = 20252763077 is a prime.

It is a super-2 number, since 2×20252763081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20252763061) 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 23 ways as a sum of consecutive naturals, for example, 957225 + ... + 978153.

Almost surely, 2^20252763081 is an apocalyptic number.

It is an amenable number.

20252763081 is a deficient number, since it is larger than the sum of its proper divisors (10547824919).

20252763081 is a wasteful number, since it uses less digits than its factorization.

20252763081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26613 (or 26610 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 20252763081 in words is "twenty billion, two hundred fifty-two million, seven hundred sixty-three thousand, eighty-one".