20000261 has 4 divisors (see below), whose sum is σ = 20241312. Its totient is φ = 19759212.

The previous prime is 20000243. The next prime is 20000269. The reversal of 20000261 is 16200002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20000261 - 2¹⁰ = 19999237 is a prime.

It is a super-3 number, since 3×20000261³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120401 + ... + 120566.

It is an arithmetic number, because the mean of its divisors is an integer number (5060328).

Almost surely, 2^20000261 is an apocalyptic number.

It is an amenable number.

20000261 is a deficient number, since it is larger than the sum of its proper divisors (241051).

20000261 is an equidigital number, since it uses as much as digits as its factorization.

20000261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241050.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20000261 is about 4472.1651355915. The cubic root of 20000261 is about 271.4429424260.

Adding to 20000261 its reverse (16200002), we get a palindrome (36200263).

The spelling of 20000261 in words is "twenty million, two hundred sixty-one", and thus it is an aban number.