20115709217 has 8 divisors (see below), whose sum is σ = 20246803680. Its totient is φ = 19984708800.

The previous prime is 20115709189. The next prime is 20115709277. The reversal of 20115709217 is 71290751102.

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 20115709217 - 2¹² = 20115705121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20115709277) 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, 434534 + ... + 478592.

It is an arithmetic number, because the mean of its divisors is an integer number (2530850460).

Almost surely, 2^20115709217 is an apocalyptic number.

It is an amenable number.

20115709217 is a deficient number, since it is larger than the sum of its proper divisors (131094463).

20115709217 is a wasteful number, since it uses less digits than its factorization.

20115709217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47023.

The product of its (nonzero) digits is 8820, while the sum is 35.

The spelling of 20115709217 in words is "twenty billion, one hundred fifteen million, seven hundred nine thousand, two hundred seventeen".