2002020402640 has 40 divisors (see below), whose sum is σ = 4654929920328. Its totient is φ = 800768163840.

The previous prime is 2002020402611. The next prime is 2002020402643. The reversal of 2002020402640 is 462040202002.

It can be written as a sum of positive squares in 4 ways, for example, as 6615544896 + 1995404857744 = 81336^2 + 1412588^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002020402643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013460 + ... + 2243020.

Almost surely, 2^{2002020402640} is an apocalyptic number.

2002020402640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2002020402640 is an abundant number, since it is smaller than the sum of its proper divisors (2652909517688).

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

2002020402640 is a wasteful number, since it uses less digits than its factorization.

2002020402640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249927 (or 1249921 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 2002020402640 its reverse (462040202002), we get a palindrome (2464060604642).

The spelling of 2002020402640 in words is "two trillion, two billion, twenty million, four hundred two thousand, six hundred forty".