19800036 has 36 divisors (see below), whose sum is σ = 52995852. Its totient is φ = 6211584.

The previous prime is 19799993. The next prime is 19800083. The reversal of 19800036 is 63000891.

It can be written as a sum of positive squares in 2 ways, for example, as 16451136 + 3348900 = 4056^2 + 1830^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 19799982 and 19800009.

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, 15565 + ... + 16788.

It is an arithmetic number, because the mean of its divisors is an integer number (1472107).

Almost surely, 2^19800036 is an apocalyptic number.

It is an amenable number.

19800036 is an abundant number, since it is smaller than the sum of its proper divisors (33195816).

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

19800036 is a wasteful number, since it uses less digits than its factorization.

19800036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380 (or 32375 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 19800036 is about 4449.7231374547. The cubic root of 19800036 is about 270.5340868594.

The spelling of 19800036 in words is "nineteen million, eight hundred thousand, thirty-six".