18820275840 has 96 divisors (see below), whose sum is σ = 64988784900. Its totient is φ = 5018738688.

The previous prime is 18820275839. The next prime is 18820275857. The reversal of 18820275840 is 4857202881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18799700544 + 20575296 = 137112^2 + 4536^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1627945 + ... + 1639464.

Almost surely, 2^18820275840 is an apocalyptic number.

18820275840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18820275840 is an abundant number, since it is smaller than the sum of its proper divisors (46168509060).

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

18820275840 is a wasteful number, since it uses less digits than its factorization.

18820275840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267434 (or 3267419 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 18820275840 in words is "eighteen billion, eight hundred twenty million, two hundred seventy-five thousand, eight hundred forty".