20744837243 has 4 divisors (see below), whose sum is σ = 22340593968. Its totient is φ = 19149080520.

The previous prime is 20744837221. The next prime is 20744837273. The reversal of 20744837243 is 34273844702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34273844702 = 2 ⋅17136922351.

It is a cyclic number.

It is not a de Polignac number, because 20744837243 - 2¹⁰ = 20744836219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20744837194 and 20744837203.

It is not an unprimeable number, because it can be changed into a prime (20744837213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797878343 + ... + 797878368.

It is an arithmetic number, because the mean of its divisors is an integer number (5585148492).

Almost surely, 2^20744837243 is an apocalyptic number.

20744837243 is a deficient number, since it is larger than the sum of its proper divisors (1595756725).

20744837243 is a wasteful number, since it uses less digits than its factorization.

20744837243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595756724.

The product of its (nonzero) digits is 903168, while the sum is 44.

The spelling of 20744837243 in words is "twenty billion, seven hundred forty-four million, eight hundred thirty-seven thousand, two hundred forty-three".