20649004 has 12 divisors (see below), whose sum is σ = 36266328. Its totient is φ = 10287200.

The previous prime is 20648993. The next prime is 20649019. The reversal of 20649004 is 40094602.

It is a self number, because there is not a number n which added to its sum of digits gives 20649004.

It is a congruent number.

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, 8062 + ... + 10309.

It is an arithmetic number, because the mean of its divisors is an integer number (3022194).

Almost surely, 2^20649004 is an apocalyptic number.

It is an amenable number.

20649004 is a deficient number, since it is larger than the sum of its proper divisors (15617324).

20649004 is a wasteful number, since it uses less digits than its factorization.

20649004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18656 (or 18654 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20649004 is about 4544.1175160860. The cubic root of 20649004 is about 274.3466761096.

The spelling of 20649004 in words is "twenty million, six hundred forty-nine thousand, four".