20511328349 has 2 divisors, whose sum is σ = 20511328350. Its totient is φ = 20511328348.

The previous prime is 20511328247. The next prime is 20511328367. The reversal of 20511328349 is 94382311502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17363332900 + 3147995449 = 131770^2 + 56107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20511328349 is a prime.

It is a super-5 number, since 5×20511328349⁵ (a number of 53 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20511328049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255664174 + 10255664175.

It is an arithmetic number, because the mean of its divisors is an integer number (10255664175).

Almost surely, 2^20511328349 is an apocalyptic number.

It is an amenable number.

20511328349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511328349 is an equidigital number, since it uses as much as digits as its factorization.

20511328349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 20511328349 in words is "twenty billion, five hundred eleven million, three hundred twenty-eight thousand, three hundred forty-nine".