20323310511 has 48 divisors (see below), whose sum is σ = 31762645344. Its totient is φ = 11524939776.

The previous prime is 20323310507. The next prime is 20323310521. The reversal of 20323310511 is 11501332302.

It is not a de Polignac number, because 20323310511 - 2² = 20323310507 is a prime.

It is a super-2 number, since 2×20323310511² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323310521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18525715 + ... + 18526811.

It is an arithmetic number, because the mean of its divisors is an integer number (661721778).

Almost surely, 2^20323310511 is an apocalyptic number.

20323310511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20323310511 is a deficient number, since it is larger than the sum of its proper divisors (11439334833).

20323310511 is a wasteful number, since it uses less digits than its factorization.

20323310511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 20323310511 its reverse (11501332302), we get a palindrome (31824642813).

The spelling of 20323310511 in words is "twenty billion, three hundred twenty-three million, three hundred ten thousand, five hundred eleven".