20051006513 has 2 divisors, whose sum is σ = 20051006514. Its totient is φ = 20051006512.

The previous prime is 20051006501. The next prime is 20051006543. The reversal of 20051006513 is 31560015002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10150159504 + 9900847009 = 100748^2 + 99503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051006513 - 2¹⁰ = 20051005489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20051006543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025503256 + 10025503257.

It is an arithmetic number, because the mean of its divisors is an integer number (10025503257).

Almost surely, 2^20051006513 is an apocalyptic number.

It is an amenable number.

20051006513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051006513 is an equidigital number, since it uses as much as digits as its factorization.

20051006513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 20051006513 in words is "twenty billion, fifty-one million, six thousand, five hundred thirteen".