20305532021 has 2 divisors, whose sum is σ = 20305532022. Its totient is φ = 20305532020.

The previous prime is 20305531973. The next prime is 20305532141. The reversal of 20305532021 is 12023550302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13726699921 + 6578832100 = 117161^2 + 81110^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305532021 - 2¹⁸ = 20305269877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20325532021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152766010 + 10152766011.

It is an arithmetic number, because the mean of its divisors is an integer number (10152766011).

Almost surely, 2^20305532021 is an apocalyptic number.

It is an amenable number.

20305532021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305532021 is an equidigital number, since it uses as much as digits as its factorization.

20305532021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The spelling of 20305532021 in words is "twenty billion, three hundred five million, five hundred thirty-two thousand, twenty-one".