20021002 has 16 divisors (see below), whose sum is σ = 31974912.
Its totient is φ = 9369280.
The previous prime is 20020943. The next prime is 20021021. The reversal of 20021002 is 20012002.
Adding to 20021002 its reverse (20012002), we get a palindrome (40033004).
It is a happy number.
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 7 ways as a sum of consecutive naturals, for example, 4953 + ... + 8035.
It is an arithmetic number, because the mean of its divisors is an integer number (1998432).
Almost surely, 220021002 is an apocalyptic number.
20021002 is a deficient number, since it is larger than the sum of its proper divisors (11953910).
20021002 is a wasteful number, since it uses less digits than its factorization.
20021002 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3293.
The product of its (nonzero) digits is 8, while the sum is 7.
The square root of 20021002 is about 4474.4834338726.
The cubic root of 20021002 is about 271.5367420856.
The spelling of 20021002 in words is "twenty million, twenty-one thousand, two".