20211140 has 24 divisors (see below), whose sum is σ = 42600600. Its totient is φ = 8054528.

The previous prime is 20211131. The next prime is 20211157. The reversal of 20211140 is 4111202.

It can be written as a sum of positive squares in 4 ways, for example, as 1149184 + 19061956 = 1072^2 + 4366^2 .

It is a congruent number.

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, 4136 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (1775025).

Almost surely, 2^20211140 is an apocalyptic number.

20211140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211140 is an abundant number, since it is smaller than the sum of its proper divisors (22389460).

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

20211140 is a wasteful number, since it uses less digits than its factorization.

20211140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751 (or 3749 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20211140 is about 4495.6801487650. The cubic root of 20211140 is about 272.3936234341.

Adding to 20211140 its reverse (4111202), we get a palindrome (24322342).

The spelling of 20211140 in words is "twenty million, two hundred eleven thousand, one hundred forty".