20042002 has 4 divisors (see below), whose sum is σ = 30063006. Its totient is φ = 10021000.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20042002 is 20024002.

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: 20024002 = 2 ⋅10012001.

It can be written as a sum of positive squares in only one way, i.e., 15752961 + 4289041 = 3969^2 + 2071^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20042002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010499 + ... + 5010502.

Almost surely, 2^20042002 is an apocalyptic number.

20042002 is a deficient number, since it is larger than the sum of its proper divisors (10021004).

20042002 is a wasteful number, since it uses less digits than its factorization.

20042002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10021003.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20042002 is about 4476.8294584449. The cubic root of 20042002 is about 271.6316470766.

Adding to 20042002 its reverse (20024002), we get a palindrome (40066004).

The spelling of 20042002 in words is "twenty million, forty-two thousand, two".