20506344 has 16 divisors (see below), whose sum is σ = 51265920. Its totient is φ = 6835440.

The previous prime is 20506337. The next prime is 20506349. The reversal of 20506344 is 44360502.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 854431 = 20506344 / (2 + 0 + 5 + 0 + 6 + 3 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (20506349) by changing a digit.

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, 427192 + ... + 427239.

It is an arithmetic number, because the mean of its divisors is an integer number (3204120).

Almost surely, 2^20506344 is an apocalyptic number.

20506344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20506344 is an abundant number, since it is smaller than the sum of its proper divisors (30759576).

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

20506344 is a wasteful number, since it uses less digits than its factorization.

20506344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854440 (or 854436 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20506344 is about 4528.3930924777. The cubic root of 20506344 is about 273.7134126787.

Adding to 20506344 its reverse (44360502), we get a palindrome (64866846).

The spelling of 20506344 in words is "twenty million, five hundred six thousand, three hundred forty-four".