20131223310 has 96 divisors (see below), whose sum is σ = 57654125568. Its totient is φ = 4832890560.

The previous prime is 20131223309. The next prime is 20131223339. The reversal of 20131223310 is 1332213102.

20131223310 is a `hidden beast` number, since 2 + 0 + 131 + 223 + 310 = 666.

It is a super-2 number, since 2×20131223310² (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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3259 + ... + 200681.

It is an arithmetic number, because the mean of its divisors is an integer number (600563808).

Almost surely, 2^20131223310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131223310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28827062784).

20131223310 is an abundant number, since it is smaller than the sum of its proper divisors (37522902258).

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

20131223310 is a wasteful number, since it uses less digits than its factorization.

20131223310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197550 (or 197547 counting only the distinct ones).

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

Adding to 20131223310 its reverse (1332213102), we get a palindrome (21463436412).

The spelling of 20131223310 in words is "twenty billion, one hundred thirty-one million, two hundred twenty-three thousand, three hundred ten".