19948647 has 16 divisors (see below), whose sum is σ = 27454592. Its totient is φ = 12877920.

The previous prime is 19948639. The next prime is 19948679. The reversal of 19948647 is 74684991.

It is not a de Polignac number, because 19948647 - 2³ = 19948639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19948596 and 19948605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19948627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11448 + ... + 13074.

It is an arithmetic number, because the mean of its divisors is an integer number (1715912).

Almost surely, 2^19948647 is an apocalyptic number.

19948647 is a deficient number, since it is larger than the sum of its proper divisors (7505945).

19948647 is a wasteful number, since it uses less digits than its factorization.

19948647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758.

The product of its digits is 435456, while the sum is 48.

The square root of 19948647 is about 4466.3908248159. The cubic root of 19948647 is about 271.2092400546.

The spelling of 19948647 in words is "nineteen million, nine hundred forty-eight thousand, six hundred forty-seven".