20115103 has 4 divisors (see below), whose sum is σ = 20154088. Its totient is φ = 20076120.

The previous prime is 20115101. The next prime is 20115113. The reversal of 20115103 is 30151102.

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

It is a cyclic number.

It is not a de Polignac number, because 20115103 - 2¹ = 20115101 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 (20115101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18708 + ... + 19753.

It is an arithmetic number, because the mean of its divisors is an integer number (5038522).

Almost surely, 2^20115103 is an apocalyptic number.

20115103 is a deficient number, since it is larger than the sum of its proper divisors (38985).

20115103 is an equidigital number, since it uses as much as digits as its factorization.

20115103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38984.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 20115103 is about 4484.9863990875. The cubic root of 20115103 is about 271.9614952343.

Adding to 20115103 its reverse (30151102), we get a palindrome (50266205).

The spelling of 20115103 in words is "twenty million, one hundred fifteen thousand, one hundred three".