20224440 has 48 divisors (see below), whose sum is σ = 65730600. Its totient is φ = 5393088.

The previous prime is 20224423. The next prime is 20224447. The reversal of 20224440 is 4442202.

20224440 is a `hidden beast` number, since 2 + 0 + 224 + 440 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27730 + ... + 28449.

Almost surely, 2^20224440 is an apocalyptic number.

20224440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20224440 is an abundant number, since it is smaller than the sum of its proper divisors (45506160).

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

20224440 is a wasteful number, since it uses less digits than its factorization.

20224440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56196 (or 56189 counting only the distinct ones).

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

The square root of 20224440 is about 4497.1591032562. The cubic root of 20224440 is about 272.4533601406.

Adding to 20224440 its reverse (4442202), we get a palindrome (24666642).

It can be divided in two parts, 202 and 24440, that added together give a palindrome (24642).

The spelling of 20224440 in words is "twenty million, two hundred twenty-four thousand, four hundred forty".