20018718587346 has 16 divisors (see below), whose sum is σ = 40040936170464. Its totient is φ = 6672323029824.

The previous prime is 20018718587261. The next prime is 20018718587363. The reversal of 20018718587346 is 64378581781002.

It is a self number, because there is not a number n which added to its sum of digits gives 20018718587346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145717111 + ... + 145854426.

It is an arithmetic number, because the mean of its divisors is an integer number (2502558510654).

Almost surely, 2^{20018718587346} is an apocalyptic number.

20018718587346 is an abundant number, since it is smaller than the sum of its proper divisors (20022217583118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20018718587346 is a wasteful number, since it uses less digits than its factorization.

20018718587346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291582985.

The product of its (nonzero) digits is 18063360, while the sum is 60.

The spelling of 20018718587346 in words is "twenty trillion, eighteen billion, seven hundred eighteen million, five hundred eighty-seven thousand, three hundred forty-six".