20803345 has 4 divisors (see below), whose sum is σ = 24964020. Its totient is φ = 16642672.

The previous prime is 20803303. The next prime is 20803373. The reversal of 20803345 is 54330802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54330802 = 2 ⋅27165401.

It can be written as a sum of positive squares in 2 ways, for example, as 15928081 + 4875264 = 3991^2 + 2208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20803345 - 2⁷ = 20803217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2080330 + ... + 2080339.

It is an arithmetic number, because the mean of its divisors is an integer number (6241005).

Almost surely, 2^20803345 is an apocalyptic number.

It is an amenable number.

20803345 is a deficient number, since it is larger than the sum of its proper divisors (4160675).

20803345 is an equidigital number, since it uses as much as digits as its factorization.

20803345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160674.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20803345 is about 4561.0684055383. The cubic root of 20803345 is about 275.0285149495.

The spelling of 20803345 in words is "twenty million, eight hundred three thousand, three hundred forty-five".