18918920810 has 32 divisors (see below), whose sum is σ = 35434858752. Its totient is φ = 7266800320.

The previous prime is 18918920789. The next prime is 18918920861. The reversal of 18918920810 is 1802981981.

It is a super-2 number, since 2×18918920810² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 354836 + ... + 404655.

It is an arithmetic number, because the mean of its divisors is an integer number (1107339336).

Almost surely, 2^18918920810 is an apocalyptic number.

18918920810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18918920810 is a deficient number, since it is larger than the sum of its proper divisors (16515937942).

18918920810 is a wasteful number, since it uses less digits than its factorization.

18918920810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759598.

The product of its (nonzero) digits is 82944, while the sum is 47.

The spelling of 18918920810 in words is "eighteen billion, nine hundred eighteen million, nine hundred twenty thousand, eight hundred ten".