20202440 has 16 divisors (see below), whose sum is σ = 45455580. Its totient is φ = 8080960.

The previous prime is 20202439. The next prime is 20202451. The reversal of 20202440 is 4420202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 1522756 = 4322^2 + 1234^2 .

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, 252491 + ... + 252570.

Almost surely, 2^20202440 is an apocalyptic number.

20202440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20202440 is an abundant number, since it is smaller than the sum of its proper divisors (25253140).

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

20202440 is a wasteful number, since it uses less digits than its factorization.

20202440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505072 (or 505068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20202440 is about 4494.7124490895. The cubic root of 20202440 is about 272.3545333640.

Adding to 20202440 its reverse (4420202), we get a palindrome (24622642).

The spelling of 20202440 in words is "twenty million, two hundred two thousand, four hundred forty".