19996743 has 16 divisors (see below), whose sum is σ = 30403296. Its totient is φ = 11581440.

The previous prime is 19996733. The next prime is 19996751. The reversal of 19996743 is 34769991.

It is not a de Polignac number, because 19996743 - 2¹⁸ = 19734599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19996692 and 19996701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19996733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14418 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (1900206).

Almost surely, 2^19996743 is an apocalyptic number.

19996743 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19996743 is a deficient number, since it is larger than the sum of its proper divisors (10406553).

19996743 is a wasteful number, since it uses less digits than its factorization.

19996743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30194.

The product of its digits is 367416, while the sum is 48.

The square root of 19996743 is about 4471.7717965030. The cubic root of 19996743 is about 271.4270260959.

The spelling of 19996743 in words is "nineteen million, nine hundred ninety-six thousand, seven hundred forty-three".