18920173480 has 64 divisors (see below), whose sum is σ = 47084138640. Its totient is φ = 6797094912.

The previous prime is 18920173469. The next prime is 18920173541. The reversal of 18920173480 is 8437102981.

It can be written as a sum of positive squares in 8 ways, for example, as 15074437284 + 3845736196 = 122778^2 + 62014^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472449 + ... + 510928.

Almost surely, 2^18920173480 is an apocalyptic number.

18920173480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18920173480 is an abundant number, since it is smaller than the sum of its proper divisors (28163965160).

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

18920173480 is a wasteful number, since it uses less digits than its factorization.

18920173480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983438 (or 983434 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18920173480 in words is "eighteen billion, nine hundred twenty million, one hundred seventy-three thousand, four hundred eighty".