20799217 has 6 divisors (see below), whose sum is σ = 21377958. Its totient is φ = 20235744.

The previous prime is 20799209. The next prime is 20799221. The reversal of 20799217 is 71299702.

It can be written as a sum of positive squares in 3 ways, for example, as 17715681 + 3083536 = 4209^2 + 1756^2 .

It is not a de Polignac number, because 20799217 - 2³ = 20799209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20799257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6228 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (3562993).

Almost surely, 2^20799217 is an apocalyptic number.

It is an amenable number.

20799217 is a deficient number, since it is larger than the sum of its proper divisors (578741).

20799217 is an equidigital number, since it uses as much as digits as its factorization.

20799217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15267 (or 15230 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 20799217 is about 4560.6158575350. The cubic root of 20799217 is about 275.0103224775.

The spelling of 20799217 in words is "twenty million, seven hundred ninety-nine thousand, two hundred seventeen".