20205072081 has 8 divisors (see below), whose sum is σ = 29933440160. Its totient is φ = 13470048036.

The previous prime is 20205072053. The next prime is 20205072113. The reversal of 20205072081 is 18027050202.

It is not a de Polignac number, because 20205072081 - 2⁹ = 20205071569 is a prime.

It is a super-2 number, since 2×20205072081² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 748336003 = 20205072081 / (2 + 0 + 2 + 0 + 5 + 0 + 7 + 2 + 0 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20205072001) 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 7 ways as a sum of consecutive naturals, for example, 374167975 + ... + 374168028.

It is an arithmetic number, because the mean of its divisors is an integer number (3741680020).

Almost surely, 2^20205072081 is an apocalyptic number.

It is an amenable number.

20205072081 is a deficient number, since it is larger than the sum of its proper divisors (9728368079).

20205072081 is an equidigital number, since it uses as much as digits as its factorization.

20205072081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748336012 (or 748336006 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The spelling of 20205072081 in words is "twenty billion, two hundred five million, seventy-two thousand, eighty-one".