20000440 has 32 divisors (see below), whose sum is σ = 45431280. Its totient is φ = 7923712.

The previous prime is 20000429. The next prime is 20000443. The reversal of 20000440 is 4400002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000443) 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, 1944 + ... + 6616.

Almost surely, 2^20000440 is an apocalyptic number.

20000440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000440 is an abundant number, since it is smaller than the sum of its proper divisors (25430840).

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

20000440 is a wasteful number, since it uses less digits than its factorization.

20000440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791 (or 4787 counting only the distinct ones).

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

The square root of 20000440 is about 4472.1851482245. The cubic root of 20000440 is about 271.4437522178.

Adding to 20000440 its reverse (4400002), we get a palindrome (24400442).

The spelling of 20000440 in words is "twenty million, four hundred forty", and thus it is an aban number.