20644622644602 has 192 divisors, whose sum is σ = 48186230929920. Its totient is φ = 5831416800000.

The previous prime is 20644622644589. The next prime is 20644622644603.

20644622644602 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20644622644603) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2085099852 + ... + 2085109752.

It is an arithmetic number, because the mean of its divisors is an integer number (250969952760).

Almost surely, 2^{20644622644602} is an apocalyptic number.

20644622644602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20644622644602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24093115464960).

20644622644602 is an abundant number, since it is smaller than the sum of its proper divisors (27541608285318).

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

20644622644602 is a wasteful number, since it uses less digits than its factorization.

20644622644602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 20644622644602 in words is "twenty trillion, six hundred forty-four billion, six hundred twenty-two million, six hundred forty-four thousand, six hundred two".