18989750020 has 24 divisors (see below), whose sum is σ = 39938833368. Its totient is φ = 7584403200.

The previous prime is 18989749979. The next prime is 18989750033. The reversal of 18989750020 is 2005798981.

It can be written as a sum of positive squares in 4 ways, for example, as 3667271364 + 15322478656 = 60558^2 + 123784^2 .

It is a super-2 number, since 2×18989750020² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705001 + ... + 731440.

It is an arithmetic number, because the mean of its divisors is an integer number (1664118057).

Almost surely, 2^18989750020 is an apocalyptic number.

18989750020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18989750020 is an abundant number, since it is smaller than the sum of its proper divisors (20949083348).

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

18989750020 is a wasteful number, since it uses less digits than its factorization.

18989750020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437111 (or 1437109 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 18989750020 in words is "eighteen billion, nine hundred eighty-nine million, seven hundred fifty thousand, twenty".