20553523843 has 2 divisors, whose sum is σ = 20553523844. Its totient is φ = 20553523842.

The previous prime is 20553523817. The next prime is 20553523877. The reversal of 20553523843 is 34832535502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20553523843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20553523796 and 20553523805.

It is not a weakly prime, because it can be changed into another prime (20553523883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276761921 + 10276761922.

It is an arithmetic number, because the mean of its divisors is an integer number (10276761922).

Almost surely, 2^20553523843 is an apocalyptic number.

20553523843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553523843 is an equidigital number, since it uses as much as digits as its factorization.

20553523843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 40.

The spelling of 20553523843 in words is "twenty billion, five hundred fifty-three million, five hundred twenty-three thousand, eight hundred forty-three".