20013725501509 has 4 divisors (see below), whose sum is σ = 21191003472204. Its totient is φ = 18836447530816.

The previous prime is 20013725501479. The next prime is 20013725501513. The reversal of 20013725501509 is 90510552731002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9655002562500 + 10358722939009 = 3107250^2 + 3218497^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013725501509 - 2⁵ = 20013725501477 is a prime.

It is a super-2 number, since 2×20013725501509² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013725571509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588638985322 + ... + 588638985355.

It is an arithmetic number, because the mean of its divisors is an integer number (5297750868051).

Almost surely, 2^{20013725501509} is an apocalyptic number.

It is an amenable number.

20013725501509 is a deficient number, since it is larger than the sum of its proper divisors (1177277970695).

20013725501509 is a wasteful number, since it uses less digits than its factorization.

20013725501509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177277970694.

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 20013725501509 in words is "twenty trillion, thirteen billion, seven hundred twenty-five million, five hundred one thousand, five hundred nine".