20002144640 has 64 divisors (see below), whose sum is σ = 47962599120. Its totient is φ = 7976601600.

The previous prime is 20002144639. The next prime is 20002144651. The reversal of 20002144640 is 4644120002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164630 + ... + 259050.

Almost surely, 2^20002144640 is an apocalyptic number.

20002144640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20002144640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23981299560).

20002144640 is an abundant number, since it is smaller than the sum of its proper divisors (27960454480).

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

20002144640 is an equidigital number, since it uses as much as digits as its factorization.

20002144640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94771 (or 94759 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20002144640 its reverse (4644120002), we get a palindrome (24646264642).

The spelling of 20002144640 in words is "twenty billion, two million, one hundred forty-four thousand, six hundred forty".