20803397 has 4 divisors (see below), whose sum is σ = 20909196. Its totient is φ = 20697600.

The previous prime is 20803373. The next prime is 20803399. The reversal of 20803397 is 79330802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 454276 = 4511^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 20803397 - 2⁸ = 20803141 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 (20803399) 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, 52604 + ... + 52997.

It is an arithmetic number, because the mean of its divisors is an integer number (5227299).

Almost surely, 2^20803397 is an apocalyptic number.

It is an amenable number.

20803397 is a deficient number, since it is larger than the sum of its proper divisors (105799).

20803397 is a wasteful number, since it uses less digits than its factorization.

20803397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105798.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20803397 is about 4561.0741059536. The cubic root of 20803397 is about 275.0287441029.

The spelling of 20803397 in words is "twenty million, eight hundred three thousand, three hundred ninety-seven".