20500555065155 has 32 divisors (see below), whose sum is σ = 27683837994240. Its totient is φ = 14442629512320.

The previous prime is 20500555065119. The next prime is 20500555065173. The reversal of 20500555065155 is 55156055500502.

It is not a de Polignac number, because 20500555065155 - 2²² = 20500550870851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21727445 + ... + 22651334.

It is an arithmetic number, because the mean of its divisors is an integer number (865119937320).

Almost surely, 2^{20500555065155} is an apocalyptic number.

20500555065155 is a deficient number, since it is larger than the sum of its proper divisors (7183282929085).

20500555065155 is a wasteful number, since it uses less digits than its factorization.

20500555065155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44379059.

The product of its (nonzero) digits is 937500, while the sum is 44.

The spelling of 20500555065155 in words is "twenty trillion, five hundred billion, five hundred fifty-five million, sixty-five thousand, one hundred fifty-five".