20020040 has 16 divisors (see below), whose sum is σ = 45045180. Its totient is φ = 8008000.

The previous prime is 20020027. The next prime is 20020093. The reversal of 20020040 is 4002002.

It can be written as a sum of positive squares in 2 ways, for example, as 20016676 + 3364 = 4474^2 + 58^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250211 + ... + 250290.

Almost surely, 2^20020040 is an apocalyptic number.

20020040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20020040 is an abundant number, since it is smaller than the sum of its proper divisors (25025140).

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

20020040 is a wasteful number, since it uses less digits than its factorization.

20020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500512 (or 500508 counting only the distinct ones).

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

The square root of 20020040 is about 4474.3759341387. The cubic root of 20020040 is about 271.5323929438.

Adding to 20020040 its reverse (4002002), we get a palindrome (24022042).

The spelling of 20020040 in words is "twenty million, twenty thousand, forty".