20079181 has 6 divisors (see below), whose sum is σ = 21191982. Its totient is φ = 19022040.

The previous prime is 20079173. The next prime is 20079233. The reversal of 20079181 is 18197002.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 7590025 = 3534^2 + 2755^2 .

It is not a de Polignac number, because 20079181 - 2³ = 20079173 is a prime.

It is a super-2 number, since 2×20079181² = 806347019261522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20079121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27450 + ... + 28171.

It is an arithmetic number, because the mean of its divisors is an integer number (3531997).

Almost surely, 2^20079181 is an apocalyptic number.

It is an amenable number.

20079181 is a deficient number, since it is larger than the sum of its proper divisors (1112801).

20079181 is an equidigital number, since it uses as much as digits as its factorization.

20079181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55659 (or 55640 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20079181 is about 4480.9799151525. The cubic root of 20079181 is about 271.7995071321.

The spelling of 20079181 in words is "twenty million, seventy-nine thousand, one hundred eighty-one".