20115077 has 4 divisors (see below), whose sum is σ = 20390700. Its totient is φ = 19839456.

The previous prime is 20115061. The next prime is 20115083. The reversal of 20115077 is 77051102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15124321 + 4990756 = 3889^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 20115077 - 2⁴ = 20115061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137702 + ... + 137847.

It is an arithmetic number, because the mean of its divisors is an integer number (5097675).

Almost surely, 2^20115077 is an apocalyptic number.

It is an amenable number.

20115077 is a deficient number, since it is larger than the sum of its proper divisors (275623).

20115077 is an equidigital number, since it uses as much as digits as its factorization.

20115077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275622.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 20115077 is about 4484.9835005271. The cubic root of 20115077 is about 271.9613780586.

Adding to 20115077 its reverse (77051102), we get a palindrome (97166179).

The spelling of 20115077 in words is "twenty million, one hundred fifteen thousand, seventy-seven".