20226649 has 2 divisors, whose sum is σ = 20226650. Its totient is φ = 20226648.

The previous prime is 20226631. The next prime is 20226673. The reversal of 20226649 is 94662202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3087049 = 4140^2 + 1757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20226649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20226649.

It is not a weakly prime, because it can be changed into another prime (20226629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10113324 + 10113325.

It is an arithmetic number, because the mean of its divisors is an integer number (10113325).

Almost surely, 2^20226649 is an apocalyptic number.

It is an amenable number.

20226649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20226649 is an equidigital number, since it uses as much as digits as its factorization.

20226649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20226649 is about 4497.4046960442. The cubic root of 20226649 is about 272.4632792873.

The spelling of 20226649 in words is "twenty million, two hundred twenty-six thousand, six hundred forty-nine".