20655660043 has 2 divisors, whose sum is σ = 20655660044. Its totient is φ = 20655660042.

The previous prime is 20655660023. The next prime is 20655660049. The reversal of 20655660043 is 34006655602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20655660043 - 2¹³ = 20655651851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20655659984 and 20655660011.

It is not a weakly prime, because it can be changed into another prime (20655660049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327830021 + 10327830022.

It is an arithmetic number, because the mean of its divisors is an integer number (10327830022).

Almost surely, 2^20655660043 is an apocalyptic number.

20655660043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20655660043 is an equidigital number, since it uses as much as digits as its factorization.

20655660043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20655660043 in words is "twenty billion, six hundred fifty-five million, six hundred sixty thousand, forty-three".