16820002 has 4 divisors (see below), whose sum is σ = 25230006. Its totient is φ = 8410000.

The previous prime is 16819993. The next prime is 16820017. The reversal of 16820002 is 20002861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20002861 = 1871 ⋅10691.

It can be written as a sum of positive squares in only one way, i.e., 8415801 + 8404201 = 2901^2 + 2899^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204999 + ... + 4205002.

Almost surely, 2^16820002 is an apocalyptic number.

16820002 is a deficient number, since it is larger than the sum of its proper divisors (8410004).

16820002 is an equidigital number, since it uses as much as digits as its factorization.

16820002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410003.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 16820002 is about 4101.2195747119. The cubic root of 16820002 is about 256.2174361158.

Adding to 16820002 its reverse (20002861), we get a palindrome (36822863).

The spelling of 16820002 in words is "sixteen million, eight hundred twenty thousand, two".