20127989907457 has 24 divisors (see below), whose sum is σ = 21610719026568. Its totient is φ = 18681122764800.

The previous prime is 20127989907437. The next prime is 20127989907629. The reversal of 20127989907457 is 75470998972102.

It can be written as a sum of positive squares in 4 ways, for example, as 11719126669041 + 8408863238416 = 3423321^2 + 2899804^2 .

It is not a de Polignac number, because 20127989907457 - 2¹⁹ = 20127989383169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20127989907437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52914013 + ... + 53293045.

It is an arithmetic number, because the mean of its divisors is an integer number (900446626107).

Almost surely, 2^{20127989907457} is an apocalyptic number.

It is an amenable number.

20127989907457 is a deficient number, since it is larger than the sum of its proper divisors (1482729119111).

20127989907457 is a wasteful number, since it uses less digits than its factorization.

20127989907457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379489 (or 379338 counting only the distinct ones).

The product of its (nonzero) digits is 160030080, while the sum is 70.

The spelling of 20127989907457 in words is "twenty trillion, one hundred twenty-seven billion, nine hundred eighty-nine million, nine hundred seven thousand, four hundred fifty-seven".