20127989907456 has 120 divisors (see below), whose sum is σ = 53706366010080. Its totient is φ = 6705159340032.

The previous prime is 20127989907437. The next prime is 20127989907629. The reversal of 20127989907456 is 65470998972102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79450620 + ... + 79703556.

It is an arithmetic number, because the mean of its divisors is an integer number (447553050084).

Almost surely, 2^{20127989907456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20127989907456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26853183005040).

20127989907456 is an abundant number, since it is smaller than the sum of its proper divisors (33578376102624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20127989907456 is an equidigital number, since it uses as much as digits as its factorization.

20127989907456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254587 (or 254561 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 69.

The spelling of 20127989907456 in words is "twenty trillion, one hundred twenty-seven billion, nine hundred eighty-nine million, nine hundred seven thousand, four hundred fifty-six".