20290103 has 4 divisors (see below), whose sum is σ = 20311728. Its totient is φ = 20268480.

The previous prime is 20290099. The next prime is 20290133. The reversal of 20290103 is 30109202.

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 20290103 - 2² = 20290099 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 (20290133) 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, 9338 + ... + 11303.

It is an arithmetic number, because the mean of its divisors is an integer number (5077932).

Almost surely, 2^20290103 is an apocalyptic number.

20290103 is a deficient number, since it is larger than the sum of its proper divisors (21625).

20290103 is an equidigital number, since it uses as much as digits as its factorization.

20290103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21624.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20290103 is about 4504.4536849656. The cubic root of 20290103 is about 272.7479011097.

Adding to 20290103 its reverse (30109202), we get a palindrome (50399305).

The spelling of 20290103 in words is "twenty million, two hundred ninety thousand, one hundred three".