20822897 has 4 divisors (see below), whose sum is σ = 21385716. Its totient is φ = 20260080.

The previous prime is 20822887. The next prime is 20822933. The reversal of 20822897 is 79822802.

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 18054001 + 2768896 = 4249^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20822897 - 2⁴ = 20822881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20822897.

It is not an unprimeable number, because it can be changed into a prime (20822887) 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, 281354 + ... + 281427.

It is an arithmetic number, because the mean of its divisors is an integer number (5346429).

Almost surely, 2^20822897 is an apocalyptic number.

It is an amenable number.

20822897 is a deficient number, since it is larger than the sum of its proper divisors (562819).

20822897 is an equidigital number, since it uses as much as digits as its factorization.

20822897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562818.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20822897 is about 4563.2112596285. The cubic root of 20822897 is about 275.1146497156.

The spelling of 20822897 in words is "twenty million, eight hundred twenty-two thousand, eight hundred ninety-seven".