20803697 has 4 divisors (see below), whose sum is σ = 21474816. Its totient is φ = 20132580.

The previous prime is 20803667. The next prime is 20803703. The reversal of 20803697 is 79630802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79630802 = 2 ⋅39815401.

It is a cyclic number.

It is not a de Polignac number, because 20803697 - 2¹⁴ = 20787313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20803637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335513 + ... + 335574.

It is an arithmetic number, because the mean of its divisors is an integer number (5368704).

Almost surely, 2^20803697 is an apocalyptic number.

It is an amenable number.

20803697 is a deficient number, since it is larger than the sum of its proper divisors (671119).

20803697 is an equidigital number, since it uses as much as digits as its factorization.

20803697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671118.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20803697 is about 4561.1069928253. The cubic root of 20803697 is about 275.0300661342.

The spelling of 20803697 in words is "twenty million, eight hundred three thousand, six hundred ninety-seven".