20071224 has 24 divisors (see below), whose sum is σ = 54359760. Its totient is φ = 6690384.

The previous prime is 20071217. The next prime is 20071267. The reversal of 20071224 is 42217002.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 20071197 and 20071206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139312 + ... + 139455.

It is an arithmetic number, because the mean of its divisors is an integer number (2264990).

Almost surely, 2^20071224 is an apocalyptic number.

20071224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20071224 is an abundant number, since it is smaller than the sum of its proper divisors (34288536).

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

20071224 is a wasteful number, since it uses less digits than its factorization.

20071224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278779 (or 278772 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20071224 is about 4480.0919633418. The cubic root of 20071224 is about 271.7635993857.

Adding to 20071224 its reverse (42217002), we get a palindrome (62288226).

The spelling of 20071224 in words is "twenty million, seventy-one thousand, two hundred twenty-four".