20322661 has 2 divisors, whose sum is σ = 20322662. Its totient is φ = 20322660.

The previous prime is 20322623. The next prime is 20322697. The reversal of 20322661 is 16622302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 688900 = 4431^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20322661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20322061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161330 + 10161331.

It is an arithmetic number, because the mean of its divisors is an integer number (10161331).

Almost surely, 2^20322661 is an apocalyptic number.

It is an amenable number.

20322661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20322661 is an equidigital number, since it uses as much as digits as its factorization.

20322661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20322661 is about 4508.0662151304. The cubic root of 20322661 is about 272.8937091528.

Adding to 20322661 its reverse (16622302), we get a palindrome (36944963).

The spelling of 20322661 in words is "twenty million, three hundred twenty-two thousand, six hundred sixty-one".