40002002020 has 24 divisors (see below), whose sum is σ = 86900902200. Its totient is φ = 15449048832.

The previous prime is 40002002011. The next prime is 40002002023. The reversal of 40002002020 is 2020020004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9116048484 + 30885953536 = 95478^2 + 175744^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 40002001988 and 40002002006.

It is not an unprimeable number, because it can be changed into a prime (40002002023) 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, 34483905 + ... + 34485064.

It is an arithmetic number, because the mean of its divisors is an integer number (3620870925).

Almost surely, 2^40002002020 is an apocalyptic number.

It is an amenable number.

40002002020 is an abundant number, since it is smaller than the sum of its proper divisors (46898900180).

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

40002002020 is a wasteful number, since it uses less digits than its factorization.

40002002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68969007 (or 68969005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

Adding to 40002002020 its reverse (2020020004), we get a palindrome (42022022024).

The spelling of 40002002020 in words is "forty billion, two million, two thousand, twenty".