20315123605555 has 32 divisors (see below), whose sum is σ = 25829743242240. Its totient is φ = 15285675540480.

The previous prime is 20315123605523. The next prime is 20315123605597. The reversal of 20315123605555 is 55550632151302.

It is not a de Polignac number, because 20315123605555 - 2⁵ = 20315123605523 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, 835004631 + ... + 835028959.

It is an arithmetic number, because the mean of its divisors is an integer number (807179476320).

Almost surely, 2^{20315123605555} is an apocalyptic number.

20315123605555 is a deficient number, since it is larger than the sum of its proper divisors (5514619636685).

20315123605555 is a wasteful number, since it uses less digits than its factorization.

20315123605555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30639.

The product of its (nonzero) digits is 675000, while the sum is 43.

Adding to 20315123605555 its reverse (55550632151302), we get a palindrome (75865755756857).

The spelling of 20315123605555 in words is "twenty trillion, three hundred fifteen billion, one hundred twenty-three million, six hundred five thousand, five hundred fifty-five".