20303313021 has 6 divisors (see below), whose sum is σ = 29327007710. Its totient is φ = 13535542008.

The previous prime is 20303312987. The next prime is 20303313031. The reversal of 20303313021 is 12031330302.

20303313021 is a `hidden beast` number, since 2 + 0 + 30 + 331 + 302 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20167124121 + 136188900 = 142011^2 + 11670^2 .

It is not a de Polignac number, because 20303313021 - 2⁶ = 20303312957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20303312985 and 20303313003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303313031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1127961826 + ... + 1127961843.

Almost surely, 2^20303313021 is an apocalyptic number.

It is an amenable number.

20303313021 is a deficient number, since it is larger than the sum of its proper divisors (9023694689).

20303313021 is a wasteful number, since it uses less digits than its factorization.

20303313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255923675 (or 2255923672 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 20303313021 its reverse (12031330302), we get a palindrome (32334643323).

The spelling of 20303313021 in words is "twenty billion, three hundred three million, three hundred thirteen thousand, twenty-one".