20007646 has 16 divisors (see below), whose sum is σ = 31737600. Its totient is φ = 9433368.

The previous prime is 20007643. The next prime is 20007661. The reversal of 20007646 is 64670002.

It is a super-2 number, since 2×20007646² = 800611796922632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20007646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007643) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 7981 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (1983600).

Almost surely, 2^20007646 is an apocalyptic number.

20007646 is a deficient number, since it is larger than the sum of its proper divisors (11729954).

20007646 is a wasteful number, since it uses less digits than its factorization.

20007646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20007646 is about 4472.9907221008. The cubic root of 20007646 is about 271.4763479809.

Adding to 20007646 its reverse (64670002), we get a palindrome (84677648).

The spelling of 20007646 in words is "twenty million, seven thousand, six hundred forty-six".