20667424 has 12 divisors (see below), whose sum is σ = 40689054. Its totient is φ = 10333696.

The previous prime is 20667397. The next prime is 20667433. The reversal of 20667424 is 42476602.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 5143824 = 3940^2 + 2268^2 .

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 as a sum of consecutive naturals, namely, 322897 + ... + 322960.

Almost surely, 2^20667424 is an apocalyptic number.

It is an amenable number.

20667424 is a deficient number, since it is larger than the sum of its proper divisors (20021630).

20667424 is an equidigital number, since it uses as much as digits as its factorization.

20667424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645867 (or 645859 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20667424 is about 4546.1438604602. The cubic root of 20667424 is about 274.4282290967.

The spelling of 20667424 in words is "twenty million, six hundred sixty-seven thousand, four hundred twenty-four".