20841472 has 22 divisors (see below), whose sum is σ = 41664638. Its totient is φ = 10420224.

The previous prime is 20841463. The next prime is 20841481. The reversal of 20841472 is 27414802.

It is an interprime number because it is at equal distance from previous prime (20841463) and next prime (20841481).

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 4064256 = 4096^2 + 2016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20841472.

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 as a sum of consecutive naturals, namely, 9153 + ... + 11200.

Almost surely, 2^20841472 is an apocalyptic number.

It is an amenable number.

20841472 is a deficient number, since it is larger than the sum of its proper divisors (20823166).

20841472 is an equidigital number, since it uses as much as digits as its factorization.

20841472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20373 (or 20355 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20841472 is about 4565.2461050857. The cubic root of 20841472 is about 275.1964304567.

The spelling of 20841472 in words is "twenty million, eight hundred forty-one thousand, four hundred seventy-two".