20013777660725 has 6 divisors (see below), whose sum is σ = 24817084299330. Its totient is φ = 16011022128560.

The previous prime is 20013777660707. The next prime is 20013777660733. The reversal of 20013777660725 is 52706677731002.

It can be written as a sum of positive squares in 3 ways, for example, as 261921839089 + 19751855821636 = 511783^2 + 4444306^2 .

It is not a de Polignac number, because 20013777660725 - 2⁴⁴ = 2421591616309 is a prime.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 400275553190 + ... + 400275553239.

It is an arithmetic number, because the mean of its divisors is an integer number (4136180716555).

Almost surely, 2^{20013777660725} is an apocalyptic number.

20013777660725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20013777660725 is a deficient number, since it is larger than the sum of its proper divisors (4803306638605).

20013777660725 is an equidigital number, since it uses as much as digits as its factorization.

20013777660725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800551106439 (or 800551106434 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 53.

The spelling of 20013777660725 in words is "twenty trillion, thirteen billion, seven hundred seventy-seven million, six hundred sixty thousand, seven hundred twenty-five".