20127989907455 has 4 divisors (see below), whose sum is σ = 24153587888952. Its totient is φ = 16102391925960.

The previous prime is 20127989907437. The next prime is 20127989907629. The reversal of 20127989907455 is 55470998972102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20127989907455 - 2¹⁶ = 20127989841919 is a prime.

It is a super-2 number, since 2×20127989907455² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012798990741 + ... + 2012798990750.

It is an arithmetic number, because the mean of its divisors is an integer number (6038396972238).

Almost surely, 2^{20127989907455} is an apocalyptic number.

20127989907455 is a deficient number, since it is larger than the sum of its proper divisors (4025597981497).

20127989907455 is an equidigital number, since it uses as much as digits as its factorization.

20127989907455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025597981496.

The product of its (nonzero) digits is 114307200, while the sum is 68.

The spelling of 20127989907455 in words is "twenty trillion, one hundred twenty-seven billion, nine hundred eighty-nine million, nine hundred seven thousand, four hundred fifty-five".