20811196 has 24 divisors (see below), whose sum is σ = 44071776. Its totient is φ = 8394240.

The previous prime is 20811173. The next prime is 20811211. The reversal of 20811196 is 69111802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21385 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (1836324).

Almost surely, 2^20811196 is an apocalyptic number.

It is an amenable number.

20811196 is an abundant number, since it is smaller than the sum of its proper divisors (23260580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20811196 is a wasteful number, since it uses less digits than its factorization.

20811196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43749 (or 43747 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 20811196 is about 4561.9289779654. The cubic root of 20811196 is about 275.0631083815.

Adding to 20811196 its reverse (69111802), we get a palindrome (89922998).

The spelling of 20811196 in words is "twenty million, eight hundred eleven thousand, one hundred ninety-six".