20541761 has 4 divisors (see below), whose sum is σ = 20552532. Its totient is φ = 20530992.

The previous prime is 20541757. The next prime is 20541767. The reversal of 20541761 is 16714502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7263025 + 13278736 = 2695^2 + 3644^2 .

It is a cyclic number.

It is not a de Polignac number, because 20541761 - 2² = 20541757 is a prime.

It is a super-2 number, since 2×20541761² = 843927889962242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20541761.

It is not an unprimeable number, because it can be changed into a prime (20541767) 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, 1670 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (5138133).

Almost surely, 2^20541761 is an apocalyptic number.

It is an amenable number.

20541761 is a deficient number, since it is larger than the sum of its proper divisors (10771).

20541761 is an equidigital number, since it uses as much as digits as its factorization.

20541761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10770.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20541761 is about 4532.3019537537. The cubic root of 20541761 is about 273.8709010525.

The spelling of 20541761 in words is "twenty million, five hundred forty-one thousand, seven hundred sixty-one".