20884207217 has 2 divisors, whose sum is σ = 20884207218. Its totient is φ = 20884207216.

The previous prime is 20884207213. The next prime is 20884207231. The reversal of 20884207217 is 71270248802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17533997056 + 3350210161 = 132416^2 + 57881^2 .

It is a cyclic number.

It is not a de Polignac number, because 20884207217 - 2² = 20884207213 is a prime.

It is a super-2 number, since 2×20884207217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20884207213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10442103608 + 10442103609.

It is an arithmetic number, because the mean of its divisors is an integer number (10442103609).

Almost surely, 2^20884207217 is an apocalyptic number.

It is an amenable number.

20884207217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20884207217 is an equidigital number, since it uses as much as digits as its factorization.

20884207217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 20884207217 in words is "twenty billion, eight hundred eighty-four million, two hundred seven thousand, two hundred seventeen".