20131958518 has 32 divisors (see below), whose sum is σ = 36746265600. Its totient is φ = 8075071104.

The previous prime is 20131958513. The next prime is 20131958549. The reversal of 20131958518 is 81585913102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131958513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193678 + ... + 278881.

It is an arithmetic number, because the mean of its divisors is an integer number (1148320800).

Almost surely, 2^20131958518 is an apocalyptic number.

20131958518 is a deficient number, since it is larger than the sum of its proper divisors (16614307082).

20131958518 is a wasteful number, since it uses less digits than its factorization.

20131958518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472764.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 20131958518 in words is "twenty billion, one hundred thirty-one million, nine hundred fifty-eight thousand, five hundred eighteen".