20218872053517 has 8 divisors (see below), whose sum is σ = 26958519240960. Its totient is φ = 13479236450880.

The previous prime is 20218872053503. The next prime is 20218872053519. The reversal of 20218872053517 is 71535027881202.

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

It is not a de Polignac number, because 20218872053517 - 2⁴² = 15820825542413 is a prime.

It is a super-5 number, since 5×20218872053517⁵ (a number of 68 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20218872053517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218872053519) 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, 2746917 + ... + 6926997.

It is an arithmetic number, because the mean of its divisors is an integer number (3369814905120).

Almost surely, 2^{20218872053517} is an apocalyptic number.

It is an amenable number.

20218872053517 is a deficient number, since it is larger than the sum of its proper divisors (6739647187443).

20218872053517 is a wasteful number, since it uses less digits than its factorization.

20218872053517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792403.

The product of its (nonzero) digits is 1881600, while the sum is 51.

The spelling of 20218872053517 in words is "twenty trillion, two hundred eighteen billion, eight hundred seventy-two million, fifty-three thousand, five hundred seventeen".