20555155125 has 24 divisors (see below), whose sum is σ = 37054095000. Its totient is φ = 10962748800.

The previous prime is 20555155043. The next prime is 20555155147. The reversal of 20555155125 is 52155155502.

20555155125 is a `hidden beast` number, since 2 + 0 + 55 + 51 + 551 + 2 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6165233361 + 14389921764 = 78519^2 + 119958^2 .

It is not a de Polignac number, because 20555155125 - 2¹⁴ = 20555138741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20555155125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9134500 + ... + 9136749.

It is an arithmetic number, because the mean of its divisors is an integer number (1543920625).

Almost surely, 2^20555155125 is an apocalyptic number.

20555155125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20555155125 is a deficient number, since it is larger than the sum of its proper divisors (16498939875).

20555155125 is a wasteful number, since it uses less digits than its factorization.

20555155125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18271270 (or 18271257 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 20555155125 in words is "twenty billion, five hundred fifty-five million, one hundred fifty-five thousand, one hundred twenty-five".