20634491577269 has 2 divisors, whose sum is σ = 20634491577270. Its totient is φ = 20634491577268.

The previous prime is 20634491577107. The next prime is 20634491577311. The reversal of 20634491577269 is 96277519443602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11050904004100 + 9583587573169 = 3324290^2 + 3095737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634491577269 - 2⁸ = 20634491577013 is a prime.

It is a super-2 number, since 2×20634491577269² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20634491576269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317245788634 + 10317245788635.

It is an arithmetic number, because the mean of its divisors is an integer number (10317245788635).

Almost surely, 2^{20634491577269} is an apocalyptic number.

It is an amenable number.

20634491577269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634491577269 is an equidigital number, since it uses as much as digits as its factorization.

20634491577269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137168640, while the sum is 65.

The spelling of 20634491577269 in words is "twenty trillion, six hundred thirty-four billion, four hundred ninety-one million, five hundred seventy-seven thousand, two hundred sixty-nine".