20901224 has 16 divisors (see below), whose sum is σ = 39259620. Its totient is φ = 10432000.

The previous prime is 20901217. The next prime is 20901233. The reversal of 20901224 is 42210902.

It can be written as a sum of positive squares in 2 ways, for example, as 17222500 + 3678724 = 4150^2 + 1918^2 .

It is a super-2 number, since 2×20901224² = 873722329396352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20901196 and 20901205.

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, 3224 + ... + 7224.

Almost surely, 2^20901224 is an apocalyptic number.

It is an amenable number.

20901224 is a deficient number, since it is larger than the sum of its proper divisors (18358396).

20901224 is a wasteful number, since it uses less digits than its factorization.

20901224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20901224 is about 4571.7856467687. The cubic root of 20901224 is about 275.4591733775.

The spelling of 20901224 in words is "twenty million, nine hundred one thousand, two hundred twenty-four".