20303104021 has 4 divisors (see below), whose sum is σ = 20303458252. Its totient is φ = 20302749792.

The previous prime is 20303103983. The next prime is 20303104033. The reversal of 20303104021 is 12040130302.

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 1869611121 + 18433492900 = 43239^2 + 135770^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303104021 - 2²⁷ = 20168886293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303103986 and 20303104004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303104121) 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, 69240 + ... + 213073.

It is an arithmetic number, because the mean of its divisors is an integer number (5075864563).

Almost surely, 2^20303104021 is an apocalyptic number.

It is an amenable number.

20303104021 is a deficient number, since it is larger than the sum of its proper divisors (354231).

20303104021 is an equidigital number, since it uses as much as digits as its factorization.

20303104021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354230.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20303104021 its reverse (12040130302), we get a palindrome (32343234323).

The spelling of 20303104021 in words is "twenty billion, three hundred three million, one hundred four thousand, twenty-one".