20144428 has 12 divisors (see below), whose sum is σ = 36205792. Its totient is φ = 9799920.

The previous prime is 20144417. The next prime is 20144437. The reversal of 20144428 is 82444102.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 67908 + ... + 68203.

Almost surely, 2^20144428 is an apocalyptic number.

It is an amenable number.

20144428 is a deficient number, since it is larger than the sum of its proper divisors (16061364).

20144428 is a wasteful number, since it uses less digits than its factorization.

20144428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136152 (or 136150 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 20144428 is about 4488.2544491149. The cubic root of 20144428 is about 272.0935916392.

The spelling of 20144428 in words is "twenty million, one hundred forty-four thousand, four hundred twenty-eight".