20143439691518 has 32 divisors (see below), whose sum is σ = 35499109615200. Its totient is φ = 8451416799360.

The previous prime is 20143439691493. The next prime is 20143439691523. The reversal of 20143439691518 is 81519693434102.

It is a super-3 number, since 3×20143439691518³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4918508 + ... + 8029856.

It is an arithmetic number, because the mean of its divisors is an integer number (1109347175475).

Almost surely, 2^{20143439691518} is an apocalyptic number.

20143439691518 is a deficient number, since it is larger than the sum of its proper divisors (15355669923682).

20143439691518 is a wasteful number, since it uses less digits than its factorization.

20143439691518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134012.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 20143439691518 in words is "twenty trillion, one hundred forty-three billion, four hundred thirty-nine million, six hundred ninety-one thousand, five hundred eighteen".