20510961007 has 2 divisors, whose sum is σ = 20510961008. Its totient is φ = 20510961006.

The previous prime is 20510961001. The next prime is 20510961011. The reversal of 20510961007 is 70016901502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20510961007 - 2⁷ = 20510960879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20510961007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20510961001) 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, 10255480503 + 10255480504.

It is an arithmetic number, because the mean of its divisors is an integer number (10255480504).

Almost surely, 2^20510961007 is an apocalyptic number.

20510961007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20510961007 is an equidigital number, since it uses as much as digits as its factorization.

20510961007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 20510961007 in words is "twenty billion, five hundred ten million, nine hundred sixty-one thousand, seven".