20281617217 has 8 divisors (see below), whose sum is σ = 20312899200. Its totient is φ = 20250358464.

The previous prime is 20281617211. The next prime is 20281617221. The reversal of 20281617217 is 71271618202.

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 20281617217 - 2²³ = 20273228609 is a prime.

It is a super-2 number, since 2×20281617217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20281617211) 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, 2518884 + ... + 2526922.

It is an arithmetic number, because the mean of its divisors is an integer number (2539112400).

Almost surely, 2^20281617217 is an apocalyptic number.

It is an amenable number.

20281617217 is a deficient number, since it is larger than the sum of its proper divisors (31281983).

20281617217 is an equidigital number, since it uses as much as digits as its factorization.

20281617217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11615.

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 20281617217 in words is "twenty billion, two hundred eighty-one million, six hundred seventeen thousand, two hundred seventeen".