20200440 has 128 divisors (see below), whose sum is σ = 68221440. Its totient is φ = 4747776.

The previous prime is 20200429. The next prime is 20200441. The reversal of 20200440 is 4400202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35599 + ... + 36161.

It is an arithmetic number, because the mean of its divisors is an integer number (532980).

Almost surely, 2^20200440 is an apocalyptic number.

20200440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20200440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34110720).

20200440 is an abundant number, since it is smaller than the sum of its proper divisors (48021000).

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

20200440 is a wasteful number, since it uses less digits than its factorization.

20200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20200440 is about 4494.4899599398. The cubic root of 20200440 is about 272.3455455546.

Adding to 20200440 its reverse (4400202), we get a palindrome (24600642).

The spelling of 20200440 in words is "twenty million, two hundred thousand, four hundred forty".