20444440 has 16 divisors (see below), whose sum is σ = 46000080. Its totient is φ = 8177760.

The previous prime is 20444429. The next prime is 20444471. The reversal of 20444440 is 4444402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255516 + ... + 255595.

It is an arithmetic number, because the mean of its divisors is an integer number (2875005).

Almost surely, 2^20444440 is an apocalyptic number.

20444440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20444440 is an abundant number, since it is smaller than the sum of its proper divisors (25555640).

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

20444440 is a wasteful number, since it uses less digits than its factorization.

20444440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511122 (or 511118 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

The square root of 20444440 is about 4521.5528306103. The cubic root of 20444440 is about 273.4377088325.

Adding to 20444440 its reverse (4444402), we get a palindrome (24888842).

It can be divided in two parts, 204 and 44440, that added together give a palindrome (44644).

The spelling of 20444440 in words is "twenty million, four hundred forty-four thousand, four hundred forty".