20331313511 has 2 divisors, whose sum is σ = 20331313512. Its totient is φ = 20331313510.

The previous prime is 20331313501. The next prime is 20331313531. The reversal of 20331313511 is 11531313302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331313511 - 2¹⁰ = 20331312487 is a prime.

It is a super-2 number, since 2×20331313511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331313501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165656755 + 10165656756.

It is an arithmetic number, because the mean of its divisors is an integer number (10165656756).

Almost surely, 2^20331313511 is an apocalyptic number.

20331313511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331313511 is an equidigital number, since it uses as much as digits as its factorization.

20331313511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 20331313511 its reverse (11531313302), we get a palindrome (31862626813).

The spelling of 20331313511 in words is "twenty billion, three hundred thirty-one million, three hundred thirteen thousand, five hundred eleven".