20261253042713 has 4 divisors (see below), whose sum is σ = 20275197471588. Its totient is φ = 20247308613840.

The previous prime is 20261253042601. The next prime is 20261253042731. The reversal of 20261253042713 is 31724035216202.

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 19380042784729 + 881210257984 = 4402277^2 + 938728^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261253042713 - 2¹² = 20261253038617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261253042413) 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, 6972212258 + ... + 6972215163.

It is an arithmetic number, because the mean of its divisors is an integer number (5068799367897).

Almost surely, 2^{20261253042713} is an apocalyptic number.

It is an amenable number.

20261253042713 is a deficient number, since it is larger than the sum of its proper divisors (13944428875).

20261253042713 is a wasteful number, since it uses less digits than its factorization.

20261253042713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13944428874.

The product of its (nonzero) digits is 120960, while the sum is 38.

Adding to 20261253042713 its reverse (31724035216202), we get a palindrome (51985288258915).

The spelling of 20261253042713 in words is "twenty trillion, two hundred sixty-one billion, two hundred fifty-three million, forty-two thousand, seven hundred thirteen".