20811450 has 48 divisors (see below), whose sum is σ = 56308896. Its totient is φ = 5044800.

The previous prime is 20811433. The next prime is 20811463. The reversal of 20811450 is 5411802.

20811450 is nontrivially palindromic in base 12.

It is a super-2 number, since 2×20811450² = 866232902205000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4657 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (1173102).

Almost surely, 2^20811450 is an apocalyptic number.

20811450 is an abundant number, since it is smaller than the sum of its proper divisors (35497446).

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

20811450 is a wasteful number, since it uses less digits than its factorization.

20811450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12639 (or 12634 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20811450 is about 4561.9568169811. The cubic root of 20811450 is about 275.0642274225.

The spelling of 20811450 in words is "twenty million, eight hundred eleven thousand, four hundred fifty".