20128920155 has 16 divisors (see below), whose sum is σ = 25793683200. Its totient is φ = 15046308480.

The previous prime is 20128920113. The next prime is 20128920167. The reversal of 20128920155 is 55102982102.

It is not a de Polignac number, because 20128920155 - 2²⁶ = 20061811291 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2234540 + ... + 2243529.

It is an arithmetic number, because the mean of its divisors is an integer number (1612105200).

Almost surely, 2^20128920155 is an apocalyptic number.

20128920155 is a deficient number, since it is larger than the sum of its proper divisors (5664763045).

20128920155 is a wasteful number, since it uses less digits than its factorization.

20128920155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478134.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 20128920155 in words is "twenty billion, one hundred twenty-eight million, nine hundred twenty thousand, one hundred fifty-five".