20753211 has 4 divisors (see below), whose sum is σ = 27670952. Its totient is φ = 13835472.

The previous prime is 20753207. The next prime is 20753251. The reversal of 20753211 is 11235702.

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

It is not a de Polignac number, because 20753211 - 2² = 20753207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20753251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3458866 + ... + 3458871.

It is an arithmetic number, because the mean of its divisors is an integer number (6917738).

Almost surely, 2^20753211 is an apocalyptic number.

20753211 is a deficient number, since it is larger than the sum of its proper divisors (6917741).

20753211 is an equidigital number, since it uses as much as digits as its factorization.

20753211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6917740.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20753211 is about 4555.5692289768. The cubic root of 20753211 is about 274.8074067487.

Adding to 20753211 its reverse (11235702), we get a palindrome (31988913).

The spelling of 20753211 in words is "twenty million, seven hundred fifty-three thousand, two hundred eleven".