20684270 has 8 divisors (see below), whose sum is σ = 37231704. Its totient is φ = 8273704.

The previous prime is 20684267. The next prime is 20684273. The reversal of 20684270 is 7248602.

It is an interprime number because it is at equal distance from previous prime (20684267) and next prime (20684273).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034204 + ... + 1034223.

It is an arithmetic number, because the mean of its divisors is an integer number (4653963).

Almost surely, 2^20684270 is an apocalyptic number.

20684270 is a deficient number, since it is larger than the sum of its proper divisors (16547434).

20684270 is a wasteful number, since it uses less digits than its factorization.

20684270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068434.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20684270 is about 4547.9962620917. The cubic root of 20684270 is about 274.5027709206.

The spelling of 20684270 in words is "twenty million, six hundred eighty-four thousand, two hundred seventy".