20658269081 has 2 divisors, whose sum is σ = 20658269082. Its totient is φ = 20658269080.

The previous prime is 20658269069. The next prime is 20658269113. The reversal of 20658269081 is 18096285602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17689000000 + 2969269081 = 133000^2 + 54491^2 .

It is a cyclic number.

It is not a de Polignac number, because 20658269081 - 2³⁰ = 19584527257 is a prime.

It is a super-2 number, since 2×20658269081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20658259081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10329134540 + 10329134541.

It is an arithmetic number, because the mean of its divisors is an integer number (10329134541).

Almost surely, 2^20658269081 is an apocalyptic number.

It is an amenable number.

20658269081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20658269081 is an equidigital number, since it uses as much as digits as its factorization.

20658269081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 20658269081 in words is "twenty billion, six hundred fifty-eight million, two hundred sixty-nine thousand, eighty-one".