20127102556 has 24 divisors (see below), whose sum is σ = 39149463024. Its totient is φ = 8976065280.

The previous prime is 20127102517. The next prime is 20127102571. The reversal of 20127102556 is 65520172102.

It is a congruent number.

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, 4313085 + ... + 4317748.

It is an arithmetic number, because the mean of its divisors is an integer number (1631227626).

Almost surely, 2^20127102556 is an apocalyptic number.

It is an amenable number.

20127102556 is a deficient number, since it is larger than the sum of its proper divisors (19022360468).

20127102556 is a wasteful number, since it uses less digits than its factorization.

20127102556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8630901 (or 8630899 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 20127102556 its reverse (65520172102), we get a palindrome (85647274658).

The spelling of 20127102556 in words is "twenty billion, one hundred twenty-seven million, one hundred two thousand, five hundred fifty-six".