23220949 has 2 divisors, whose sum is σ = 23220950. Its totient is φ = 23220948.

The previous prime is 23220947. The next prime is 23220959. The reversal of 23220949 is 94902232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15069924 + 8151025 = 3882^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 23220949 - 2¹ = 23220947 is a prime.

Together with 23220947, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23220949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23220947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610474 + 11610475.

It is an arithmetic number, because the mean of its divisors is an integer number (11610475).

Almost surely, 2^23220949 is an apocalyptic number.

It is an amenable number.

23220949 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220949 is an equidigital number, since it uses as much as digits as its factorization.

23220949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 23220949 is about 4818.8119905221. The cubic root of 23220949 is about 285.2944489415.

The spelling of 23220949 in words is "twenty-three million, two hundred twenty thousand, nine hundred forty-nine".