40020020 has 24 divisors (see below), whose sum is σ = 84352968. Its totient is φ = 15948800.

The previous prime is 40020017. The next prime is 40020037. The reversal of 40020020 is 2002004.

It can be written as a sum of positive squares in 4 ways, for example, as 355216 + 39664804 = 596^2 + 6298^2 .

40020020 is a modest number, since divided by 20020 gives 40 as remainder.

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, 2060 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (3514707).

Almost surely, 2^40020020 is an apocalyptic number.

It is an amenable number.

40020020 is an abundant number, since it is smaller than the sum of its proper divisors (44332948).

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

40020020 is a wasteful number, since it uses less digits than its factorization.

40020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7411 (or 7409 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 40020020 is about 6326.1378423174. The cubic root of 40020020 is about 342.0522360165.

Adding to 40020020 its reverse (2002004), we get a palindrome (42022024).

The spelling of 40020020 in words is "forty million, twenty thousand, twenty".