20001224 has 32 divisors (see below), whose sum is σ = 39748800. Its totient is φ = 9408960.

The previous prime is 20001217. The next prime is 20001227. The reversal of 20001224 is 42210002.

It is a super-2 number, since 2×20001224² = 800097922996352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20001227) 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, 27149 + ... + 27875.

It is an arithmetic number, because the mean of its divisors is an integer number (1242150).

Almost surely, 2^20001224 is an apocalyptic number.

It is an amenable number.

20001224 is a deficient number, since it is larger than the sum of its proper divisors (19747576).

20001224 is a wasteful number, since it uses less digits than its factorization.

20001224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20001224 is about 4472.2728002661. The cubic root of 20001224 is about 271.4472989585.

Adding to 20001224 its reverse (42210002), we get a palindrome (62211226).

The spelling of 20001224 in words is "twenty million, one thousand, two hundred twenty-four".