20501224 has 16 divisors (see below), whose sum is σ = 38545920. Its totient is φ = 10222320.

The previous prime is 20501213. The next prime is 20501227. The reversal of 20501224 is 42210502.

It is a junction number, because it is equal to n+sod(n) for n = 20501198 and 20501207.

It is not an unprimeable number, because it can be changed into a prime (20501227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (2409120).

Almost surely, 2^20501224 is an apocalyptic number.

It is an amenable number.

20501224 is a deficient number, since it is larger than the sum of its proper divisors (18044696).

20501224 is a wasteful number, since it uses less digits than its factorization.

20501224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080 (or 7076 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20501224 is about 4527.8277352391. The cubic root of 20501224 is about 273.6906306342.

Adding to 20501224 its reverse (42210502), we get a palindrome (62711726).

The spelling of 20501224 in words is "twenty million, five hundred one thousand, two hundred twenty-four".