20023311312 has 120 divisors (see below), whose sum is σ = 57705908520. Its totient is φ = 6476682240.

The previous prime is 20023311289. The next prime is 20023311337. The reversal of 20023311312 is 21311332002.

20023311312 is a `hidden beast` number, since 20 + 0 + 2 + 331 + 1 + 312 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 182898576 + 19840412736 = 13524^2 + 140856^2 .

It is a super-2 number, since 2×20023311312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2067762 + ... + 2077422.

It is an arithmetic number, because the mean of its divisors is an integer number (480882571).

Almost surely, 2^20023311312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20023311312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28852954260).

20023311312 is an abundant number, since it is smaller than the sum of its proper divisors (37682597208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20023311312 is a wasteful number, since it uses less digits than its factorization.

20023311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10101 (or 10092 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20023311312 its reverse (21311332002), we get a palindrome (41334643314).

The spelling of 20023311312 in words is "twenty billion, twenty-three million, three hundred eleven thousand, three hundred twelve".