19818086436 has 72 divisors (see below), whose sum is σ = 52313264640. Its totient is φ = 6314039424.

The previous prime is 19818086429. The next prime is 19818086507. The reversal of 19818086436 is 63468081891.

19818086436 is a `hidden beast` number, since 198 + 18 + 0 + 8 + 6 + 436 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1183176 + ... + 1199808.

It is an arithmetic number, because the mean of its divisors is an integer number (726573120).

Almost surely, 2^19818086436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19818086436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26156632320).

19818086436 is an abundant number, since it is smaller than the sum of its proper divisors (32495178204).

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

19818086436 is a wasteful number, since it uses less digits than its factorization.

19818086436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18105 (or 18100 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 19818086436 in words is "nineteen billion, eight hundred eighteen million, eighty-six thousand, four hundred thirty-six".