20740224 has 32 divisors (see below), whose sum is σ = 55092240. Its totient is φ = 6913280.

The previous prime is 20740217. The next prime is 20740241. The reversal of 20740224 is 42204702.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20740224.

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, 26622 + ... + 27389.

Almost surely, 2^20740224 is an apocalyptic number.

20740224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20740224 is an abundant number, since it is smaller than the sum of its proper divisors (34352016).

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

20740224 is an equidigital number, since it uses as much as digits as its factorization.

20740224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54028 (or 54016 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20740224 is about 4554.1436077489. The cubic root of 20740224 is about 274.7500715487.

Adding to 20740224 its reverse (42204702), we get a palindrome (62944926).

The spelling of 20740224 in words is "twenty million, seven hundred forty thousand, two hundred twenty-four".