20418360709 has 4 divisors (see below), whose sum is σ = 20420316000. Its totient is φ = 20416405420.

The previous prime is 20418360701. The next prime is 20418360737. The reversal of 20418360709 is 90706381402.

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 not a de Polignac number, because 20418360709 - 2³ = 20418360701 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 (20418360701) 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, 961897 + ... + 982894.

It is an arithmetic number, because the mean of its divisors is an integer number (5105079000).

Almost surely, 2^20418360709 is an apocalyptic number.

It is an amenable number.

20418360709 is a deficient number, since it is larger than the sum of its proper divisors (1955291).

20418360709 is a wasteful number, since it uses less digits than its factorization.

20418360709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955290.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20418360709 in words is "twenty billion, four hundred eighteen million, three hundred sixty thousand, seven hundred nine".