40202020 has 24 divisors (see below), whose sum is σ = 84579768. Its totient is φ = 16051200.

The previous prime is 40202003. The next prime is 40202021. The reversal of 40202020 is 2020204.

It is a happy number.

40202020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20647936 + 19554084 = 4544^2 + 4422^2 .

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

40202020 is a modest number, since divided by 202020 gives 40 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 40201988 and 40202006.

It is not an unprimeable number, because it can be changed into a prime (40202021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11700 + ... + 14740.

It is an arithmetic number, because the mean of its divisors is an integer number (3524157).

Almost surely, 2^40202020 is an apocalyptic number.

It is an amenable number.

40202020 is an abundant number, since it is smaller than the sum of its proper divisors (44377748).

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

40202020 is a wasteful number, since it uses less digits than its factorization.

40202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711 (or 3709 counting only the distinct ones).

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

The square root of 40202020 is about 6340.5062889331. The cubic root of 40202020 is about 342.5699716738.

Adding to 40202020 its reverse (2020204), we get a palindrome (42222224).

The spelling of 40202020 in words is "forty million, two hundred two thousand, twenty".