20001002 has 16 divisors (see below), whose sum is σ = 34344960. Its totient is φ = 8557488.

The previous prime is 20001001. The next prime is 20001019. The reversal of 20001002 is 20010002.

It is not an unprimeable number, because it can be changed into a prime (20001001) 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 in 7 ways as a sum of consecutive naturals, for example, 14999 + ... + 16277.

It is an arithmetic number, because the mean of its divisors is an integer number (2146560).

Almost surely, 2^20001002 is an apocalyptic number.

20001002 is a deficient number, since it is larger than the sum of its proper divisors (14343958).

20001002 is a wasteful number, since it uses less digits than its factorization.

20001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 20001002 is about 4472.2479806021. The cubic root of 20001002 is about 271.4462946612.

Adding to 20001002 its reverse (20010002), we get a palindrome (40011004).

Multiplying 20001002 by its reverse (20010002), we get a palindrome (400220090022004).

The spelling of 20001002 in words is "twenty million, one thousand, two".