20605459 has 8 divisors (see below), whose sum is σ = 23778560. Its totient is φ = 17489736.

The previous prime is 20605397. The next prime is 20605463. The reversal of 20605459 is 95450602.

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 20605459 - 2¹³ = 20597267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20605459.

It is not an unprimeable number, because it can be changed into a prime (20605159) 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, 13569 + ... + 15010.

It is an arithmetic number, because the mean of its divisors is an integer number (2972320).

Almost surely, 2^20605459 is an apocalyptic number.

20605459 is a deficient number, since it is larger than the sum of its proper divisors (3173101).

20605459 is a wasteful number, since it uses less digits than its factorization.

20605459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28689.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 20605459 is about 4539.3236280309. The cubic root of 20605459 is about 274.1536912813.

The spelling of 20605459 in words is "twenty million, six hundred five thousand, four hundred fifty-nine".