20605853 has 8 divisors (see below), whose sum is σ = 21931200. Its totient is φ = 19293120.

The previous prime is 20605843. The next prime is 20605859. The reversal of 20605853 is 35850602.

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 20605853 - 2⁶ = 20605789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605859) 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, 338 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (2741400).

Almost surely, 2^20605853 is an apocalyptic number.

It is an amenable number.

20605853 is a deficient number, since it is larger than the sum of its proper divisors (1325347).

20605853 is a wasteful number, since it uses less digits than its factorization.

20605853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6307.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20605853 is about 4539.3670263595. The cubic root of 20605853 is about 274.1554386478.

The spelling of 20605853 in words is "twenty million, six hundred five thousand, eight hundred fifty-three".