20220961 has 2 divisors, whose sum is σ = 20220962. Its totient is φ = 20220960.

The previous prime is 20220947. The next prime is 20220983. The reversal of 20220961 is 16902202.

It is a happy number.

It is an a-pointer prime, because the next prime (20220983) can be obtained adding 20220961 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 9884736 = 3215^2 + 3144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220961 - 2¹⁷ = 20089889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20220901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110480 + 10110481.

It is an arithmetic number, because the mean of its divisors is an integer number (10110481).

Almost surely, 2^20220961 is an apocalyptic number.

It is an amenable number.

20220961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220961 is an equidigital number, since it uses as much as digits as its factorization.

20220961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20220961 is about 4496.7722868742. The cubic root of 20220961 is about 272.4377368057.

The spelling of 20220961 in words is "twenty million, two hundred twenty thousand, nine hundred sixty-one".