20510002 has 4 divisors (see below), whose sum is σ = 30765006. Its totient is φ = 10255000.

The previous prime is 20509981. The next prime is 20510027. The reversal of 20510002 is 20001502.

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., 20259001 + 251001 = 4501^2 + 501^2 .

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 as a sum of consecutive naturals, namely, 5127499 + ... + 5127502.

Almost surely, 2^20510002 is an apocalyptic number.

20510002 is a deficient number, since it is larger than the sum of its proper divisors (10255004).

20510002 is a wasteful number, since it uses less digits than its factorization.

20510002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10255003.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20510002 is about 4528.7969704989. The cubic root of 20510002 is about 273.7296870592.

Adding to 20510002 its reverse (20001502), we get a palindrome (40511504).

The spelling of 20510002 in words is "twenty million, five hundred ten thousand, two".