20527319909 has 2 divisors, whose sum is σ = 20527319910. Its totient is φ = 20527319908.

The previous prime is 20527319863. The next prime is 20527319957. The reversal of 20527319909 is 90991372502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19931227684 + 596092225 = 141178^2 + 24415^2 .

It is a cyclic number.

It is not a de Polignac number, because 20527319909 - 2¹⁶ = 20527254373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20527319999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10263659954 + 10263659955.

It is an arithmetic number, because the mean of its divisors is an integer number (10263659955).

Almost surely, 2^20527319909 is an apocalyptic number.

It is an amenable number.

20527319909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20527319909 is an equidigital number, since it uses as much as digits as its factorization.

20527319909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 20527319909 in words is "twenty billion, five hundred twenty-seven million, three hundred nineteen thousand, nine hundred nine".