20013721544125 has 16 divisors (see below), whose sum is σ = 25448390995248. Its totient is φ = 15708883320000.

The previous prime is 20013721544123. The next prime is 20013721544143. The reversal of 20013721544125 is 52144512731002.

It can be written as a sum of positive squares in 8 ways, for example, as 651486279609 + 19362235264516 = 807147^2 + 4400254^2 .

It is not a de Polignac number, because 20013721544125 - 2¹ = 20013721544123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013721544123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1510462926 + ... + 1510476175.

It is an arithmetic number, because the mean of its divisors is an integer number (1590524437203).

Almost surely, 2^{20013721544125} is an apocalyptic number.

20013721544125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20013721544125 is a deficient number, since it is larger than the sum of its proper divisors (5434669451123).

20013721544125 is an equidigital number, since it uses as much as digits as its factorization.

20013721544125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020939169 (or 3020939159 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 20013721544125 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, five hundred forty-four thousand, one hundred twenty-five".