20244440 has 32 divisors (see below), whose sum is σ = 46010160. Its totient is φ = 8016000.

The previous prime is 20244431. The next prime is 20244449. The reversal of 20244440 is 4444202.

It is an interprime number because it is at equal distance from previous prime (20244431) and next prime (20244449).

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244449) 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, 1535 + ... + 6545.

Almost surely, 2^20244440 is an apocalyptic number.

20244440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20244440 is an abundant number, since it is smaller than the sum of its proper divisors (25765720).

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

20244440 is a wasteful number, since it uses less digits than its factorization.

20244440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123 (or 5119 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 20244440 is about 4499.3821798109. The cubic root of 20244440 is about 272.5431404920.

Adding to 20244440 its reverse (4444202), we get a palindrome (24688642).

The spelling of 20244440 in words is "twenty million, two hundred forty-four thousand, four hundred forty".