20081002 has 4 divisors (see below), whose sum is σ = 30121506. Its totient is φ = 10040500.

The previous prime is 20080997. The next prime is 20081003. The reversal of 20081002 is 20018002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 3767481 = 4039^2 + 1941^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20081003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5020249 + ... + 5020252.

Almost surely, 2^20081002 is an apocalyptic number.

20081002 is a deficient number, since it is larger than the sum of its proper divisors (10040504).

20081002 is a wasteful number, since it uses less digits than its factorization.

20081002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10040503.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20081002 is about 4481.1831027085. The cubic root of 20081002 is about 271.8077234689.

Adding to 20081002 its reverse (20018002), we get a palindrome (40099004).

The spelling of 20081002 in words is "twenty million, eighty-one thousand, two".