20444340 has 48 divisors (see below), whose sum is σ = 65423232. Its totient is φ = 4672896.

The previous prime is 20444329. The next prime is 20444341. The reversal of 20444340 is 4344402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23919 + ... + 24758.

It is an arithmetic number, because the mean of its divisors is an integer number (1362984).

Almost surely, 2^20444340 is an apocalyptic number.

20444340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20444340 is an abundant number, since it is smaller than the sum of its proper divisors (44978892).

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

20444340 is a wasteful number, since it uses less digits than its factorization.

20444340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48696 (or 48694 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 20444340 is about 4521.5417724489. The cubic root of 20444340 is about 273.4372630093.

Adding to 20444340 its reverse (4344402), we get a palindrome (24788742).

It can be divided in two parts, 204 and 44340, that added together give a palindrome (44544).

The spelling of 20444340 in words is "twenty million, four hundred forty-four thousand, three hundred forty".