20967428 has 6 divisors (see below), whose sum is σ = 36693006. Its totient is φ = 10483712.

The previous prime is 20967413. The next prime is 20967433. The reversal of 20967428 is 82476902.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 6160324 = 3848^2 + 2482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20967391 and 20967400.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2620925 + ... + 2620932.

It is an arithmetic number, because the mean of its divisors is an integer number (6115501).

Almost surely, 2^20967428 is an apocalyptic number.

It is an amenable number.

20967428 is a deficient number, since it is larger than the sum of its proper divisors (15725578).

20967428 is a wasteful number, since it uses less digits than its factorization.

20967428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241861 (or 5241859 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20967428 is about 4579.0204192600. The cubic root of 20967428 is about 275.7497030678.

The spelling of 20967428 in words is "twenty million, nine hundred sixty-seven thousand, four hundred twenty-eight".