20696221 has 8 divisors (see below), whose sum is σ = 25472384. Its totient is φ = 16374960.

The previous prime is 20696219. The next prime is 20696243. The reversal of 20696221 is 12269602.

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

It is not a de Polignac number, because 20696221 - 2¹ = 20696219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20696221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20696281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113625 + ... + 113806.

It is an arithmetic number, because the mean of its divisors is an integer number (3184048).

Almost surely, 2^20696221 is an apocalyptic number.

It is an amenable number.

20696221 is a deficient number, since it is larger than the sum of its proper divisors (4776163).

20696221 is a wasteful number, since it uses less digits than its factorization.

20696221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227451.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20696221 is about 4549.3099476734. The cubic root of 20696221 is about 274.5556283335. Note that the first 3 decimals are identical.

The spelling of 20696221 in words is "twenty million, six hundred ninety-six thousand, two hundred twenty-one".