20947268 has 12 divisors (see below), whose sum is σ = 36689772. Its totient is φ = 10464480.

The previous prime is 20947249. The next prime is 20947271. The reversal of 20947268 is 86274902.

It can be written as a sum of positive squares in 2 ways, for example, as 15225604 + 5721664 = 3902^2 + 2392^2 .

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, 7778 + ... + 10118.

It is an arithmetic number, because the mean of its divisors is an integer number (3057481).

Almost surely, 2^20947268 is an apocalyptic number.

It is an amenable number.

20947268 is a deficient number, since it is larger than the sum of its proper divisors (15742504).

20947268 is a wasteful number, since it uses less digits than its factorization.

20947268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4582 (or 4580 counting only the distinct ones).

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

The square root of 20947268 is about 4576.8185456712. The cubic root of 20947268 is about 275.6612977462.

The spelling of 20947268 in words is "twenty million, nine hundred forty-seven thousand, two hundred sixty-eight".