20121704 has 16 divisors (see below), whose sum is σ = 38347620. Its totient is φ = 9895680.

The previous prime is 20121691. The next prime is 20121713. The reversal of 20121704 is 40712102.

It can be written as a sum of positive squares in 2 ways, for example, as 17656804 + 2464900 = 4202^2 + 1570^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20129 + ... + 21104.

Almost surely, 2^20121704 is an apocalyptic number.

It is an amenable number.

20121704 is a deficient number, since it is larger than the sum of its proper divisors (18225916).

20121704 is a wasteful number, since it uses less digits than its factorization.

20121704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41300 (or 41296 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20121704 is about 4485.7222383915. The cubic root of 20121704 is about 271.9912410674.

Adding to 20121704 its reverse (40712102), we get a palindrome (60833806).

The spelling of 20121704 in words is "twenty million, one hundred twenty-one thousand, seven hundred four".