20690103 has 16 divisors (see below), whose sum is σ = 32172800. Its totient is φ = 11822328.

The previous prime is 20690099. The next prime is 20690143. The reversal of 20690103 is 30109602.

It is not a de Polignac number, because 20690103 - 2² = 20690099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20690103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9025 + ... + 11082.

It is an arithmetic number, because the mean of its divisors is an integer number (2010800).

Almost surely, 2^20690103 is an apocalyptic number.

20690103 is a deficient number, since it is larger than the sum of its proper divisors (11482697).

20690103 is an equidigital number, since it uses as much as digits as its factorization.

20690103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131 (or 20117 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20690103 is about 4548.6374883035. The cubic root of 20690103 is about 274.5285719145.

Adding to 20690103 its reverse (30109602), we get a palindrome (50799705).

It can be divided in two parts, 206 and 90103, that added together give a palindrome (90309).

The spelling of 20690103 in words is "twenty million, six hundred ninety thousand, one hundred three".