20646002 has 8 divisors (see below), whose sum is σ = 33351276. Its totient is φ = 9528912.

The previous prime is 20645981. The next prime is 20646011. The reversal of 20646002 is 20064602.

It can be written as a sum of positive squares in 2 ways, for example, as 19971961 + 674041 = 4469^2 + 821^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20646002³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 397013 + ... + 397064.

Almost surely, 2^20646002 is an apocalyptic number.

20646002 is a deficient number, since it is larger than the sum of its proper divisors (12705274).

20646002 is a wasteful number, since it uses less digits than its factorization.

20646002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794092.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20646002 is about 4543.7871869180. The cubic root of 20646002 is about 274.3333804137. Note that the first 4 decimals are identical.

It can be divided in two parts, 2064600 and 2, that added together give a palindrome (2064602).

The spelling of 20646002 in words is "twenty million, six hundred forty-six thousand, two".