20411800517 has 8 divisors (see below), whose sum is σ = 20478261336. Its totient is φ = 20345375232.

The previous prime is 20411800511. The next prime is 20411800523. The reversal of 20411800517 is 71500811402.

It is an interprime number because it is at equal distance from previous prime (20411800511) and next prime (20411800523).

It can be written as a sum of positive squares in 4 ways, for example, as 1172446081 + 19239354436 = 34241^2 + 138706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20411800517 - 2²⁸ = 20143365061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20411800517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411800511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1608923 + ... + 1621559.

It is an arithmetic number, because the mean of its divisors is an integer number (2559782667).

Almost surely, 2^20411800517 is an apocalyptic number.

It is an amenable number.

20411800517 is a deficient number, since it is larger than the sum of its proper divisors (66460819).

20411800517 is a wasteful number, since it uses less digits than its factorization.

20411800517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17767.

The product of its (nonzero) digits is 2240, while the sum is 29.

The spelling of 20411800517 in words is "twenty billion, four hundred eleven million, eight hundred thousand, five hundred seventeen".