20911677518 has 8 divisors (see below), whose sum is σ = 31368826920. Its totient is φ = 10455401880.

The previous prime is 20911677517. The next prime is 20911677539. The reversal of 20911677518 is 81577611902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911677517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154913 + ... + 256556.

It is an arithmetic number, because the mean of its divisors is an integer number (3921103365).

Almost surely, 2^20911677518 is an apocalyptic number.

20911677518 is a deficient number, since it is larger than the sum of its proper divisors (10457149402).

20911677518 is a wasteful number, since it uses less digits than its factorization.

20911677518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436882.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 20911677518 in words is "twenty billion, nine hundred eleven million, six hundred seventy-seven thousand, five hundred eighteen".