20511323313044 has 24 divisors (see below), whose sum is σ = 36916023580128. Its totient is φ = 9966309363360.

The previous prime is 20511323313037. The next prime is 20511323313049. The reversal of 20511323313044 is 44031332311502.

It is a self number, because there is not a number n which added to its sum of digits gives 20511323313044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511323313049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302635862 + ... + 302703629.

It is an arithmetic number, because the mean of its divisors is an integer number (1538167649172).

Almost surely, 2^{20511323313044} is an apocalyptic number.

It is an amenable number.

20511323313044 is a deficient number, since it is larger than the sum of its proper divisors (16404700267084).

20511323313044 is a wasteful number, since it uses less digits than its factorization.

20511323313044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605339735 (or 605339733 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 20511323313044 its reverse (44031332311502), we get a palindrome (64542655624546).

The spelling of 20511323313044 in words is "twenty trillion, five hundred eleven billion, three hundred twenty-three million, three hundred thirteen thousand, forty-four".