20956224 has 28 divisors (see below), whose sum is σ = 55447184. Its totient is φ = 6985344.

The previous prime is 20956211. The next prime is 20956261. The reversal of 20956224 is 42265902.

It is a junction number, because it is equal to n+sod(n) for n = 20956191 and 20956200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54382 + ... + 54765.

Almost surely, 2^20956224 is an apocalyptic number.

20956224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20956224 is an abundant number, since it is smaller than the sum of its proper divisors (34490960).

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

20956224 is a wasteful number, since it uses less digits than its factorization.

20956224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109162 (or 109152 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20956224 is about 4577.7968500142. The cubic root of 20956224 is about 275.7005784584.

The spelling of 20956224 in words is "twenty million, nine hundred fifty-six thousand, two hundred twenty-four".