20724836242 has 16 divisors (see below), whose sum is σ = 34391024064. Its totient is φ = 9287698000.

The previous prime is 20724836239. The next prime is 20724836243. The reversal of 20724836242 is 24263842702.

It is a junction number, because it is equal to n+sod(n) for n = 20724836195 and 20724836204.

It is not an unprimeable number, because it can be changed into a prime (20724836243) 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 7 ways as a sum of consecutive naturals, for example, 6632509 + ... + 6635632.

It is an arithmetic number, because the mean of its divisors is an integer number (2149439004).

Almost surely, 2^20724836242 is an apocalyptic number.

20724836242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20724836242 is a deficient number, since it is larger than the sum of its proper divisors (13666187822).

20724836242 is a wasteful number, since it uses less digits than its factorization.

20724836242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13268225.

The product of its (nonzero) digits is 258048, while the sum is 40.

The spelling of 20724836242 in words is "twenty billion, seven hundred twenty-four million, eight hundred thirty-six thousand, two hundred forty-two".