20443428 has 30 divisors (see below), whose sum is σ = 53444006. Its totient is φ = 6814368.

The previous prime is 20443417. The next prime is 20443433. The reversal of 20443428 is 82434402.

It is a happy number.

20443428 is a `hidden beast` number, since 204 + 434 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 9474084 = 3312^2 + 3078^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31225 + ... + 31872.

Almost surely, 2^20443428 is an apocalyptic number.

It is an amenable number.

20443428 is an abundant number, since it is smaller than the sum of its proper divisors (33000578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20443428 is a wasteful number, since it uses less digits than its factorization.

20443428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63113 (or 63102 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 20443428 is about 4521.4409207685. The cubic root of 20443428 is about 273.4331970349.

The spelling of 20443428 in words is "twenty million, four hundred forty-three thousand, four hundred twenty-eight".