20974228 has 24 divisors (see below), whose sum is σ = 41336064. Its totient is φ = 9225600.

The previous prime is 20974211. The next prime is 20974231. The reversal of 20974228 is 82247902.

It is a junction number, because it is equal to n+sod(n) for n = 20974193 and 20974202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6325 + ... + 9052.

It is an arithmetic number, because the mean of its divisors is an integer number (1722336).

Almost surely, 2^20974228 is an apocalyptic number.

It is an amenable number.

20974228 is a deficient number, since it is larger than the sum of its proper divisors (20361836).

20974228 is a wasteful number, since it uses less digits than its factorization.

20974228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15423 (or 15421 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20974228 is about 4579.7628759577. The cubic root of 20974228 is about 275.7795095421.

The spelling of 20974228 in words is "twenty million, nine hundred seventy-four thousand, two hundred twenty-eight".