20643501041 has 2 divisors, whose sum is σ = 20643501042. Its totient is φ = 20643501040.

The previous prime is 20643501037. The next prime is 20643501049. The reversal of 20643501041 is 14010534602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20239330225 + 404170816 = 142265^2 + 20104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20643501041 - 2² = 20643501037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20643501041.

It is not a weakly prime, because it can be changed into another prime (20643501049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10321750520 + 10321750521.

It is an arithmetic number, because the mean of its divisors is an integer number (10321750521).

Almost surely, 2^20643501041 is an apocalyptic number.

It is an amenable number.

20643501041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20643501041 is an equidigital number, since it uses as much as digits as its factorization.

20643501041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 20643501041 in words is "twenty billion, six hundred forty-three million, five hundred one thousand, forty-one".