20115306 has 24 divisors (see below), whose sum is σ = 43773444. Its totient is φ = 6675840.

The previous prime is 20115287. The next prime is 20115307. The reversal of 20115306 is 60351102.

It can be written as a sum of positive squares in 2 ways, for example, as 20115225 + 81 = 4485^2 + 9^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20115307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2020 + ... + 6656.

Almost surely, 2^20115306 is an apocalyptic number.

20115306 is an abundant number, since it is smaller than the sum of its proper divisors (23658138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20115306 is a wasteful number, since it uses less digits than its factorization.

20115306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886 (or 4883 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20115306 is about 4485.0090300912. The cubic root of 20115306 is about 271.9624101024.

Adding to 20115306 its reverse (60351102), we get a palindrome (80466408).

The spelling of 20115306 in words is "twenty million, one hundred fifteen thousand, three hundred six".