20604405 has 8 divisors (see below), whose sum is σ = 32967072. Its totient is φ = 10989008.

The previous prime is 20604359. The next prime is 20604407. The reversal of 20604405 is 50440602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20604405 - 2⁷ = 20604277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686799 + ... + 686828.

It is an arithmetic number, because the mean of its divisors is an integer number (4120884).

Almost surely, 2^20604405 is an apocalyptic number.

It is an amenable number.

20604405 is a deficient number, since it is larger than the sum of its proper divisors (12362667).

20604405 is a wasteful number, since it uses less digits than its factorization.

20604405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373635.

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

The square root of 20604405 is about 4539.2075299550. The cubic root of 20604405 is about 274.1490167447.

The spelling of 20604405 in words is "twenty million, six hundred four thousand, four hundred five".