20831220018 has 48 divisors (see below), whose sum is σ = 51596004096. Its totient is φ = 5950169280.

The previous prime is 20831220001. The next prime is 20831220029. The reversal of 20831220018 is 81002213802.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20831219973 and 20831220000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 492903 + ... + 533493.

It is an arithmetic number, because the mean of its divisors is an integer number (1074916752).

Almost surely, 2^20831220018 is an apocalyptic number.

20831220018 is an abundant number, since it is smaller than the sum of its proper divisors (30764784078).

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

20831220018 is a wasteful number, since it uses less digits than its factorization.

20831220018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44679 (or 44676 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 20831220018 in words is "twenty billion, eight hundred thirty-one million, two hundred twenty thousand, eighteen".