20216755 has 8 divisors (see below), whose sum is σ = 26126352. Its totient is φ = 14929248.

The previous prime is 20216699. The next prime is 20216759. The reversal of 20216755 is 55761202.

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

It is a cyclic number.

It is not a de Polignac number, because 20216755 - 2⁹ = 20216243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20216759) 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, 155449 + ... + 155578.

It is an arithmetic number, because the mean of its divisors is an integer number (3265794).

Almost surely, 2^20216755 is an apocalyptic number.

20216755 is a deficient number, since it is larger than the sum of its proper divisors (5909597).

20216755 is a wasteful number, since it uses less digits than its factorization.

20216755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311045.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20216755 is about 4496.3045937748. The cubic root of 20216755 is about 272.4188462993.

Adding to 20216755 its reverse (55761202), we get a palindrome (75977957).

The spelling of 20216755 in words is "twenty million, two hundred sixteen thousand, seven hundred fifty-five".