20458020221 has 4 divisors (see below), whose sum is σ = 20458325244. Its totient is φ = 20457715200.

The previous prime is 20458020179. The next prime is 20458020277. The reversal of 20458020221 is 12202085402.

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 6501196900 + 13956823321 = 80630^2 + 118139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20458020221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20458020281) 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 in 3 ways as a sum of consecutive naturals, for example, 3140 + ... + 202301.

It is an arithmetic number, because the mean of its divisors is an integer number (5114581311).

Almost surely, 2^20458020221 is an apocalyptic number.

It is an amenable number.

20458020221 is a deficient number, since it is larger than the sum of its proper divisors (305023).

20458020221 is an equidigital number, since it uses as much as digits as its factorization.

20458020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305022.

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 20458020221 in words is "twenty billion, four hundred fifty-eight million, twenty thousand, two hundred twenty-one".