20442244987 has 2 divisors, whose sum is σ = 20442244988. Its totient is φ = 20442244986.

The previous prime is 20442244973. The next prime is 20442245009. The reversal of 20442244987 is 78944224402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442244987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442244387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221122493 + 10221122494.

It is an arithmetic number, because the mean of its divisors is an integer number (10221122494).

Almost surely, 2^20442244987 is an apocalyptic number.

20442244987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442244987 is an equidigital number, since it uses as much as digits as its factorization.

20442244987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1032192, while the sum is 46.

The spelling of 20442244987 in words is "twenty billion, four hundred forty-two million, two hundred forty-four thousand, nine hundred eighty-seven".