20523144 has 16 divisors (see below), whose sum is σ = 51307920. Its totient is φ = 6841040.

The previous prime is 20523143. The next prime is 20523149. The reversal of 20523144 is 44132502.

It is a self number, because there is not a number n which added to its sum of digits gives 20523144.

It is not an unprimeable number, because it can be changed into a prime (20523143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427542 + ... + 427589.

It is an arithmetic number, because the mean of its divisors is an integer number (3206745).

Almost surely, 2^20523144 is an apocalyptic number.

20523144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20523144 is an abundant number, since it is smaller than the sum of its proper divisors (30784776).

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

20523144 is a wasteful number, since it uses less digits than its factorization.

20523144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855140 (or 855136 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20523144 is about 4530.2476753484. The cubic root of 20523144 is about 273.7881396371.

Adding to 20523144 its reverse (44132502), we get a palindrome (64655646).

The spelling of 20523144 in words is "twenty million, five hundred twenty-three thousand, one hundred forty-four".