20604240 has 80 divisors (see below), whose sum is σ = 70977600. Its totient is φ = 5493888.

The previous prime is 20604211. The next prime is 20604247. The reversal of 20604240 is 4240602.

20604240 is a `hidden beast` number, since 20 + 604 + 2 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604247) 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, 2610 + ... + 6929.

It is an arithmetic number, because the mean of its divisors is an integer number (887220).

Almost surely, 2^20604240 is an apocalyptic number.

20604240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20604240 is an abundant number, since it is smaller than the sum of its proper divisors (50373360).

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

20604240 is a wasteful number, since it uses less digits than its factorization.

20604240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561 (or 9549 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20604240 is about 4539.1893549399. The cubic root of 20604240 is about 274.1482849479.

Adding to 20604240 its reverse (4240602), we get a palindrome (24844842).

The spelling of 20604240 in words is "twenty million, six hundred four thousand, two hundred forty".