20481811 has 4 divisors (see below), whose sum is σ = 23407792. Its totient is φ = 17555832.

The previous prime is 20481767. The next prime is 20481817. The reversal of 20481811 is 11818402.

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

It is not a de Polignac number, because 20481811 - 2¹⁹ = 19957523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20481817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462980 + ... + 1462993.

It is an arithmetic number, because the mean of its divisors is an integer number (5851948).

Almost surely, 2^20481811 is an apocalyptic number.

20481811 is a deficient number, since it is larger than the sum of its proper divisors (2925981).

20481811 is an equidigital number, since it uses as much as digits as its factorization.

20481811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925980.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 20481811 is about 4525.6834842927. The cubic root of 20481811 is about 273.6042157265.

The spelling of 20481811 in words is "twenty million, four hundred eighty-one thousand, eight hundred eleven".