20507316660281 has 32 divisors (see below), whose sum is σ = 23263582702080. Its totient is φ = 17918616268800.

The previous prime is 20507316660277. The next prime is 20507316660287. The reversal of 20507316660281 is 18206661370502.

It is a cyclic number.

It is not a de Polignac number, because 20507316660281 - 2² = 20507316660277 is a prime.

It is a super-2 number, since 2×20507316660281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20507316660287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3147725 + ... + 7136021.

It is an arithmetic number, because the mean of its divisors is an integer number (726986959440).

Almost surely, 2^{20507316660281} is an apocalyptic number.

It is an amenable number.

20507316660281 is a deficient number, since it is larger than the sum of its proper divisors (2756266041799).

20507316660281 is a wasteful number, since it uses less digits than its factorization.

20507316660281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988545.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20507316660281 in words is "twenty trillion, five hundred seven billion, three hundred sixteen million, six hundred sixty thousand, two hundred eighty-one".