20705603 has 4 divisors (see below), whose sum is σ = 20761488. Its totient is φ = 20649720.

The previous prime is 20705593. The next prime is 20705621. The reversal of 20705603 is 30650702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20705603 - 2⁶ = 20705539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20705653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27383 + ... + 28128.

It is an arithmetic number, because the mean of its divisors is an integer number (5190372).

Almost surely, 2^20705603 is an apocalyptic number.

20705603 is a deficient number, since it is larger than the sum of its proper divisors (55885).

20705603 is an equidigital number, since it uses as much as digits as its factorization.

20705603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55884.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20705603 is about 4550.3409762346. The cubic root of 20705603 is about 274.5971092036.

The spelling of 20705603 in words is "twenty million, seven hundred five thousand, six hundred three".