20811802 has 16 divisors (see below), whose sum is σ = 35848800. Its totient is φ = 8961840.

The previous prime is 20811799. The next prime is 20811811.

20811802 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×20811802² = 866262204974408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24477 + ... + 25312.

It is an arithmetic number, because the mean of its divisors is an integer number (2240550).

Almost surely, 2^20811802 is an apocalyptic number.

20811802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20811802 is a deficient number, since it is larger than the sum of its proper divisors (15036998).

20811802 is a wasteful number, since it uses less digits than its factorization.

20811802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49821.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20811802 is about 4561.9953967535. The cubic root of 20811802 is about 275.0657782044.

It can be divided in two parts, 2081 and 1802, that added together give a palindrome (3883).

The spelling of 20811802 in words is "twenty million, eight hundred eleven thousand, eight hundred two".