20144436 has 48 divisors (see below), whose sum is σ = 51038400. Its totient is φ = 6147072.

The previous prime is 20144417. The next prime is 20144437. The reversal of 20144436 is 63444102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144437) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21220 + ... + 22148.

It is an arithmetic number, because the mean of its divisors is an integer number (1063300).

Almost surely, 2^20144436 is an apocalyptic number.

20144436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20144436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25519200).

20144436 is an abundant number, since it is smaller than the sum of its proper divisors (30893964).

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

20144436 is a wasteful number, since it uses less digits than its factorization.

20144436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20144436 is about 4488.2553403299. The cubic root of 20144436 is about 272.0936276583.

Adding to 20144436 its reverse (63444102), we get a palindrome (83588538).

The spelling of 20144436 in words is "twenty million, one hundred forty-four thousand, four hundred thirty-six".