20520156641155 has 16 divisors (see below), whose sum is σ = 26078033782944. Its totient is φ = 15447292116480.

The previous prime is 20520156641107. The next prime is 20520156641161. The reversal of 20520156641155 is 55114665102502.

It is not a de Polignac number, because 20520156641155 - 2¹⁵ = 20520156608387 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24418497 + ... + 25244866.

It is an arithmetic number, because the mean of its divisors is an integer number (1629877111434).

Almost surely, 2^{20520156641155} is an apocalyptic number.

20520156641155 is a deficient number, since it is larger than the sum of its proper divisors (5557877141789).

20520156641155 is a wasteful number, since it uses less digits than its factorization.

20520156641155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49668246.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 20520156641155 in words is "twenty trillion, five hundred twenty billion, one hundred fifty-six million, six hundred forty-one thousand, one hundred fifty-five".