20644340310 has 96 divisors (see below), whose sum is σ = 58590604800. Its totient is φ = 5001633600.

The previous prime is 20644340293. The next prime is 20644340323. The reversal of 20644340310 is 1304344602.

20644340310 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 4 + 340 + 310 = 666.

It is a super-2 number, since 2×20644340310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1906291 + ... + 1917089.

It is an arithmetic number, because the mean of its divisors is an integer number (610318800).

Almost surely, 2^20644340310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20644340310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29295302400).

20644340310 is an abundant number, since it is smaller than the sum of its proper divisors (37946264490).

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

20644340310 is a wasteful number, since it uses less digits than its factorization.

20644340310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12754 (or 12751 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 20644340310 its reverse (1304344602), we get a palindrome (21948684912).

It can be divided in two parts, 206443 and 40310, that added together give a triangular number (246753 = T₇₀₂).

The spelling of 20644340310 in words is "twenty billion, six hundred forty-four million, three hundred forty thousand, three hundred ten".