20445080251 has 2 divisors, whose sum is σ = 20445080252. Its totient is φ = 20445080250.

The previous prime is 20445080239. The next prime is 20445080329. The reversal of 20445080251 is 15208054402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20445080251 - 2⁵ = 20445080219 is a prime.

It is not a weakly prime, because it can be changed into another prime (20445030251) 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, 10222540125 + 10222540126.

It is an arithmetic number, because the mean of its divisors is an integer number (10222540126).

Almost surely, 2^20445080251 is an apocalyptic number.

20445080251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20445080251 is an equidigital number, since it uses as much as digits as its factorization.

20445080251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12800, while the sum is 31.

The spelling of 20445080251 in words is "twenty billion, four hundred forty-five million, eighty thousand, two hundred fifty-one".