18201996 has 30 divisors (see below), whose sum is σ = 47584460. Its totient is φ = 6067224.

The previous prime is 18201979. The next prime is 18202003. The reversal of 18201996 is 69910281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18201996.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 27766 + ... + 28413.

Almost surely, 2^18201996 is an apocalyptic number.

It is an amenable number.

18201996 is an abundant number, since it is smaller than the sum of its proper divisors (29382464).

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

18201996 is a wasteful number, since it uses less digits than its factorization.

18201996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56195 (or 56184 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 18201996 is about 4266.3797299350. The cubic root of 18201996 is about 263.0508270158.

The spelling of 18201996 in words is "eighteen million, two hundred one thousand, nine hundred ninety-six".