20202040 has 16 divisors (see below), whose sum is σ = 45454680. Its totient is φ = 8080800.

The previous prime is 20202031. The next prime is 20202071. The reversal of 20202040 is 4020202.

It is a happy number.

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

It is a congruent number.

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, 252486 + ... + 252565.

Almost surely, 2^20202040 is an apocalyptic number.

20202040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20202040 is an abundant number, since it is smaller than the sum of its proper divisors (25252640).

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

20202040 is a wasteful number, since it uses less digits than its factorization.

20202040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505062 (or 505058 counting only the distinct ones).

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

The square root of 20202040 is about 4494.6679521406. The cubic root of 20202040 is about 272.3527358496.

Adding to 20202040 its reverse (4020202), we get a palindrome (24222242).

The spelling of 20202040 in words is "twenty million, two hundred two thousand, forty".