20443697 has 2 divisors, whose sum is σ = 20443698. Its totient is φ = 20443696.

The previous prime is 20443693. The next prime is 20443727. The reversal of 20443697 is 79634402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 2202256 = 4271^2 + 1484^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443697 - 2² = 20443693 is a prime.

It is a super-3 number, since 3×20443697³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20443691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221848 + 10221849.

It is an arithmetic number, because the mean of its divisors is an integer number (10221849).

Almost surely, 2^20443697 is an apocalyptic number.

It is an amenable number.

20443697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443697 is an equidigital number, since it uses as much as digits as its factorization.

20443697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20443697 is about 4521.4706678248. The cubic root of 20443697 is about 273.4343963316.

The spelling of 20443697 in words is "twenty million, four hundred forty-three thousand, six hundred ninety-seven".