20447332487 has 2 divisors, whose sum is σ = 20447332488. Its totient is φ = 20447332486.

The previous prime is 20447332397. The next prime is 20447332519. The reversal of 20447332487 is 78423374402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20447332487 - 2²⁶ = 20380223623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20447334487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223666243 + 10223666244.

It is an arithmetic number, because the mean of its divisors is an integer number (10223666244).

Almost surely, 2^20447332487 is an apocalyptic number.

20447332487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20447332487 is an equidigital number, since it uses as much as digits as its factorization.

20447332487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 44.

The spelling of 20447332487 in words is "twenty billion, four hundred forty-seven million, three hundred thirty-two thousand, four hundred eighty-seven".