20444040 has 96 divisors (see below), whose sum is σ = 67181400. Its totient is φ = 5391360.

The previous prime is 20444027. The next prime is 20444059. The reversal of 20444040 is 4044402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16208676 + 4235364 = 4026^2 + 2058^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38980 + ... + 39500.

Almost surely, 2^20444040 is an apocalyptic number.

20444040 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 20444040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33590700).

20444040 is an abundant number, since it is smaller than the sum of its proper divisors (46737360).

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

20444040 is a wasteful number, since it uses less digits than its factorization.

20444040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20444040 is about 4521.5085978023. The cubic root of 20444040 is about 273.4359255311.

Adding to 20444040 its reverse (4044402), we get a palindrome (24488442).

It can be divided in two parts, 204440 and 40, that added together give a triangular number (204480 = T₆₃₉).

The spelling of 20444040 in words is "twenty million, four hundred forty-four thousand, forty".