20412799717 has 4 divisors (see below), whose sum is σ = 20515376800. Its totient is φ = 20310222636.

The previous prime is 20412799711. The next prime is 20412799733. The reversal of 20412799717 is 71799721402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20412799717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412799711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51288243 + ... + 51288640.

It is an arithmetic number, because the mean of its divisors is an integer number (5128844200).

Almost surely, 2^20412799717 is an apocalyptic number.

It is an amenable number.

20412799717 is a deficient number, since it is larger than the sum of its proper divisors (102577083).

20412799717 is a wasteful number, since it uses less digits than its factorization.

20412799717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102577082.

The product of its (nonzero) digits is 444528, while the sum is 49.

The spelling of 20412799717 in words is "twenty billion, four hundred twelve million, seven hundred ninety-nine thousand, seven hundred seventeen".