20315255565 has 32 divisors (see below), whose sum is σ = 35530560000. Its totient is φ = 9830041920.

The previous prime is 20315255549. The next prime is 20315255567. The reversal of 20315255565 is 56555251302.

It is not a de Polignac number, because 20315255565 - 2⁴ = 20315255549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315255567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41035 + ... + 205704.

It is an arithmetic number, because the mean of its divisors is an integer number (1110330000).

Almost surely, 2^20315255565 is an apocalyptic number.

It is an amenable number.

20315255565 is a deficient number, since it is larger than the sum of its proper divisors (15215304435).

20315255565 is a wasteful number, since it uses less digits than its factorization.

20315255565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247257.

The product of its (nonzero) digits is 225000, while the sum is 39.

The spelling of 20315255565 in words is "twenty billion, three hundred fifteen million, two hundred fifty-five thousand, five hundred sixty-five".