20320002021 has 12 divisors (see below), whose sum is σ = 29780278976. Its totient is φ = 12315152520.

The previous prime is 20320001987. The next prime is 20320002107. The reversal of 20320002021 is 12020002302.

It is not a de Polignac number, because 20320002021 - 2¹⁰ = 20320000997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320001988 and 20320002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320002121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27988621 + ... + 27989346.

Almost surely, 2^20320002021 is an apocalyptic number.

It is an amenable number.

20320002021 is a deficient number, since it is larger than the sum of its proper divisors (9460276955).

20320002021 is a wasteful number, since it uses less digits than its factorization.

20320002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55977992 (or 55977981 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 20320002021 its reverse (12020002302), we get a palindrome (32340004323).

The spelling of 20320002021 in words is "twenty billion, three hundred twenty million, two thousand, twenty-one".