20706403 has 4 divisors (see below), whose sum is σ = 20896480. Its totient is φ = 20516328.

The previous prime is 20706401. The next prime is 20706407. The reversal of 20706403 is 30460702.

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 20706403 - 2¹ = 20706401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20706401) 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, 94875 + ... + 95092.

It is an arithmetic number, because the mean of its divisors is an integer number (5224120).

Almost surely, 2^20706403 is an apocalyptic number.

20706403 is a deficient number, since it is larger than the sum of its proper divisors (190077).

20706403 is a wasteful number, since it uses less digits than its factorization.

20706403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190076.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20706403 is about 4550.4288808858. The cubic root of 20706403 is about 274.6006456837.

The spelling of 20706403 in words is "twenty million, seven hundred six thousand, four hundred three".