20403101 has 4 divisors (see below), whose sum is σ = 20521212. Its totient is φ = 20284992.

The previous prime is 20403083. The next prime is 20403121. The reversal of 20403101 is 10130402.

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 17859076 + 2544025 = 4226^2 + 1595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20403101 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 (20403121) 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, 58796 + ... + 59141.

It is an arithmetic number, because the mean of its divisors is an integer number (5130303).

Almost surely, 2^20403101 is an apocalyptic number.

It is an amenable number.

20403101 is a deficient number, since it is larger than the sum of its proper divisors (118111).

20403101 is a wasteful number, since it uses less digits than its factorization.

20403101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118110.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20403101 is about 4516.9791896798. The cubic root of 20403101 is about 273.2532859326.

Adding to 20403101 its reverse (10130402), we get a palindrome (30533503).

The spelling of 20403101 in words is "twenty million, four hundred three thousand, one hundred one".