20623144 has 16 divisors (see below), whose sum is σ = 39568320. Its totient is φ = 10071600.

The previous prime is 20623139. The next prime is 20623181. The reversal of 20623144 is 44132602.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 29632 + ... + 30319.

It is an arithmetic number, because the mean of its divisors is an integer number (2473020).

Almost surely, 2^20623144 is an apocalyptic number.

It is an amenable number.

20623144 is a deficient number, since it is larger than the sum of its proper divisors (18945176).

20623144 is a wasteful number, since it uses less digits than its factorization.

20623144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60000 (or 59996 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20623144 is about 4541.2711876742. The cubic root of 20623144 is about 274.2321012731.

Adding to 20623144 its reverse (44132602), we get a palindrome (64755746).

The spelling of 20623144 in words is "twenty million, six hundred twenty-three thousand, one hundred forty-four".