20121670 has 8 divisors (see below), whose sum is σ = 36219024. Its totient is φ = 8048664.

The previous prime is 20121667. The next prime is 20121683. The reversal of 20121670 is 7612102.

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

It is a congruent number.

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, 1006074 + ... + 1006093.

It is an arithmetic number, because the mean of its divisors is an integer number (4527378).

Almost surely, 2^20121670 is an apocalyptic number.

20121670 is a deficient number, since it is larger than the sum of its proper divisors (16097354).

20121670 is a wasteful number, since it uses less digits than its factorization.

20121670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012174.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20121670 is about 4485.7184485877. The cubic root of 20121670 is about 271.9910878712.

Adding to 20121670 its reverse (7612102), we get a palindrome (27733772).

The spelling of 20121670 in words is "twenty million, one hundred twenty-one thousand, six hundred seventy".