20442015947 has 2 divisors, whose sum is σ = 20442015948. Its totient is φ = 20442015946.

The previous prime is 20442015943. The next prime is 20442015949. The reversal of 20442015947 is 74951024402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20442015947 - 2² = 20442015943 is a prime.

Together with 20442015949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20442015947.

It is not a weakly prime, because it can be changed into another prime (20442015943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221007973 + 10221007974.

It is an arithmetic number, because the mean of its divisors is an integer number (10221007974).

Almost surely, 2^20442015947 is an apocalyptic number.

20442015947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442015947 is an equidigital number, since it uses as much as digits as its factorization.

20442015947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 20442015947 in words is "twenty billion, four hundred forty-two million, fifteen thousand, nine hundred forty-seven".