20653211 has 4 divisors (see below), whose sum is σ = 20842800. Its totient is φ = 20463624.

The previous prime is 20653189. The next prime is 20653229. The reversal of 20653211 is 11235602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20653211 - 2¹⁰ = 20652187 is a prime.

It is a super-2 number, since 2×20653211² = 853110249221042, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (20653271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94631 + ... + 94848.

It is an arithmetic number, because the mean of its divisors is an integer number (5210700).

Almost surely, 2^20653211 is an apocalyptic number.

20653211 is a deficient number, since it is larger than the sum of its proper divisors (189589).

20653211 is a wasteful number, since it uses less digits than its factorization.

20653211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189588.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20653211 is about 4544.5803986727. The cubic root of 20653211 is about 274.3653065174.

Adding to 20653211 its reverse (11235602), we get a palindrome (31888813).

The spelling of 20653211 in words is "twenty million, six hundred fifty-three thousand, two hundred eleven".