20143261 has 4 divisors (see below), whose sum is σ = 20175232. Its totient is φ = 20111292.

The previous prime is 20143243. The next prime is 20143271. The reversal of 20143261 is 16234102.

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 20143261 - 2¹³ = 20135069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143231) 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, 15021 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (5043808).

Almost surely, 2^20143261 is an apocalyptic number.

It is an amenable number.

20143261 is a deficient number, since it is larger than the sum of its proper divisors (31971).

20143261 is an equidigital number, since it uses as much as digits as its factorization.

20143261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31970.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20143261 is about 4488.1244412338. The cubic root of 20143261 is about 272.0883372607.

Adding to 20143261 its reverse (16234102), we get a palindrome (36377363).

The spelling of 20143261 in words is "twenty million, one hundred forty-three thousand, two hundred sixty-one".