20030440 has 32 divisors (see below), whose sum is σ = 45434880. Its totient is φ = 7947072.

The previous prime is 20030411. The next prime is 20030443. The reversal of 20030440 is 4403002.

It is a self number, because there is not a number n which added to its sum of digits gives 20030440.

It is not an unprimeable number, because it can be changed into a prime (20030443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3109 + ... + 7051.

It is an arithmetic number, because the mean of its divisors is an integer number (1419840).

Almost surely, 2^20030440 is an apocalyptic number.

20030440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20030440 is an abundant number, since it is smaller than the sum of its proper divisors (25404440).

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

20030440 is a wasteful number, since it uses less digits than its factorization.

20030440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081 (or 4077 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20030440 is about 4475.5379564919. The cubic root of 20030440 is about 271.5794033066.

Adding to 20030440 its reverse (4403002), we get a palindrome (24433442).

The spelling of 20030440 in words is "twenty million, thirty thousand, four hundred forty".