16720226 has 8 divisors (see below), whose sum is σ = 25758300. Its totient is φ = 8134128.

The previous prime is 16720217. The next prime is 16720243. The reversal of 16720226 is 62202761.

It can be written as a sum of positive squares in 2 ways, for example, as 11662225 + 5058001 = 3415^2 + 2249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16720195 and 16720204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112901 + ... + 113048.

Almost surely, 2^16720226 is an apocalyptic number.

16720226 is a deficient number, since it is larger than the sum of its proper divisors (9038074).

16720226 is a wasteful number, since it uses less digits than its factorization.

16720226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225988.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 16720226 is about 4089.0372950121. The cubic root of 16720226 is about 255.7098050373.

Adding to 16720226 its reverse (62202761), we get a palindrome (78922987).

The spelling of 16720226 in words is "sixteen million, seven hundred twenty thousand, two hundred twenty-six".