19999954 has 16 divisors (see below), whose sum is σ = 32435928. Its totient is φ = 9194112.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999954 is 45999991.

It can be written as a sum of positive squares in 4 ways, for example, as 6640929 + 13359025 = 2577^2 + 3655^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19999895 and 19999904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5814 + ... + 8590.

Almost surely, 2^19999954 is an apocalyptic number.

19999954 is a deficient number, since it is larger than the sum of its proper divisors (12435974).

19999954 is a wasteful number, since it uses less digits than its factorization.

19999954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069.

The product of its digits is 1180980, while the sum is 55.

The square root of 19999954 is about 4472.1308120403. The cubic root of 19999954 is about 271.4415535540.

The spelling of 19999954 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred fifty-four".