20642724041 has 2 divisors, whose sum is σ = 20642724042. Its totient is φ = 20642724040.

The previous prime is 20642724031. The next prime is 20642724073. The reversal of 20642724041 is 14042724602.

It is an a-pointer prime, because the next prime (20642724073) can be obtained adding 20642724041 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20496217225 + 146506816 = 143165^2 + 12104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20642724041 is a prime.

It is a super-2 number, since 2×20642724041² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642723989 and 20642724007.

It is not a weakly prime, because it can be changed into another prime (20642724031) 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 as a sum of consecutive naturals, namely, 10321362020 + 10321362021.

It is an arithmetic number, because the mean of its divisors is an integer number (10321362021).

Almost surely, 2^20642724041 is an apocalyptic number.

It is an amenable number.

20642724041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20642724041 is an equidigital number, since it uses as much as digits as its factorization.

20642724041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

The spelling of 20642724041 in words is "twenty billion, six hundred forty-two million, seven hundred twenty-four thousand, forty-one".