20018871850 has 24 divisors (see below), whose sum is σ = 37309174560. Its totient is φ = 7991619120.

The previous prime is 20018871799. The next prime is 20018871857. The reversal of 20018871850 is 5817881002.

It is not an unprimeable number, because it can be changed into a prime (20018871857) 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 11 ways as a sum of consecutive naturals, for example, 372840 + ... + 423139.

It is an arithmetic number, because the mean of its divisors is an integer number (1554548940).

Almost surely, 2^20018871850 is an apocalyptic number.

20018871850 is a deficient number, since it is larger than the sum of its proper divisors (17290302710).

20018871850 is a wasteful number, since it uses less digits than its factorization.

20018871850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796494 (or 796489 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 40.

The spelling of 20018871850 in words is "twenty billion, eighteen million, eight hundred seventy-one thousand, eight hundred fifty".