20801597 has 2 divisors, whose sum is σ = 20801598. Its totient is φ = 20801596.

The previous prime is 20801593. The next prime is 20801617. The reversal of 20801597 is 79510802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 6255001 = 3814^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20801597 - 2² = 20801593 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20801593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400798 + 10400799.

It is an arithmetic number, because the mean of its divisors is an integer number (10400799).

Almost surely, 2^20801597 is an apocalyptic number.

It is an amenable number.

20801597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801597 is an equidigital number, since it uses as much as digits as its factorization.

20801597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20801597 is about 4560.8767797431. The cubic root of 20801597 is about 275.0208116481.

The spelling of 20801597 in words is "twenty million, eight hundred one thousand, five hundred ninety-seven".