20884145287418 has 24 divisors (see below), whose sum is σ = 38584273229172. Its totient is φ = 8423856921984.

The previous prime is 20884145287381. The next prime is 20884145287459. The reversal of 20884145287418 is 81478254148802.

It can be written as a sum of positive squares in 2 ways, for example, as 18598234129489 + 2285911157929 = 4312567^2 + 1511923^2 .

It is a super-2 number, since 2×20884145287418² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6267749021 + ... + 6267752352.

Almost surely, 2^{20884145287418} is an apocalyptic number.

20884145287418 is a deficient number, since it is larger than the sum of its proper divisors (17700127941754).

20884145287418 is a wasteful number, since it uses less digits than its factorization.

20884145287418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12535501406 (or 12535501399 counting only the distinct ones).

The product of its (nonzero) digits is 36700160, while the sum is 62.

The spelling of 20884145287418 in words is "twenty trillion, eight hundred eighty-four billion, one hundred forty-five million, two hundred eighty-seven thousand, four hundred eighteen".