19997836 has 24 divisors (see below), whose sum is σ = 35661024. Its totient is φ = 9811200.

The previous prime is 19997827. The next prime is 19997837. The reversal of 19997836 is 63879991.

It is not an unprimeable number, because it can be changed into a prime (19997837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68106 + ... + 68398.

It is an arithmetic number, because the mean of its divisors is an integer number (1485876).

Almost surely, 2^19997836 is an apocalyptic number.

It is an amenable number.

19997836 is a deficient number, since it is larger than the sum of its proper divisors (15663188).

19997836 is a wasteful number, since it uses less digits than its factorization.

19997836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 559 counting only the distinct ones).

The product of its digits is 734832, while the sum is 52.

The square root of 19997836 is about 4471.8940058995. The cubic root of 19997836 is about 271.4319713068.

The spelling of 19997836 in words is "nineteen million, nine hundred ninety-seven thousand, eight hundred thirty-six".