20444146 has 4 divisors (see below), whose sum is σ = 30666222. Its totient is φ = 10222072.

The previous prime is 20444113. The next prime is 20444147. The reversal of 20444146 is 64144402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 239121 = 4495^2 + 489^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20444146.

It is not an unprimeable number, because it can be changed into a prime (20444147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5111035 + ... + 5111038.

Almost surely, 2^20444146 is an apocalyptic number.

20444146 is a deficient number, since it is larger than the sum of its proper divisors (10222076).

20444146 is a wasteful number, since it uses less digits than its factorization.

20444146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222075.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20444146 is about 4521.5203195386. The cubic root of 20444146 is about 273.4363981082.

Adding to 20444146 its reverse (64144402), we get a palindrome (84588548).

The spelling of 20444146 in words is "twenty million, four hundred forty-four thousand, one hundred forty-six".