20053640 has 16 divisors (see below), whose sum is σ = 45120780. Its totient is φ = 8021440.

The previous prime is 20053639. The next prime is 20053673. The reversal of 20053640 is 4635002.

It can be written as a sum of positive squares in 2 ways, for example, as 20052484 + 1156 = 4478^2 + 34^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 250631 + ... + 250710.

Almost surely, 2^20053640 is an apocalyptic number.

20053640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20053640 is an abundant number, since it is smaller than the sum of its proper divisors (25067140).

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

20053640 is a wasteful number, since it uses less digits than its factorization.

20053640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501352 (or 501348 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20053640 is about 4478.1290736199. The cubic root of 20053640 is about 271.6842139711.

Adding to 20053640 its reverse (4635002), we get a palindrome (24688642).

The spelling of 20053640 in words is "twenty million, fifty-three thousand, six hundred forty".