20861341 has 4 divisors (see below), whose sum is σ = 21001500. Its totient is φ = 20721184.

The previous prime is 20861339. The next prime is 20861371. The reversal of 20861341 is 14316802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6200100 + 14661241 = 2490^2 + 3829^2 .

It is a cyclic number.

It is not a de Polignac number, because 20861341 - 2¹ = 20861339 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 (20861371) 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, 69856 + ... + 70153.

It is an arithmetic number, because the mean of its divisors is an integer number (5250375).

Almost surely, 2^20861341 is an apocalyptic number.

It is an amenable number.

20861341 is a deficient number, since it is larger than the sum of its proper divisors (140159).

20861341 is a wasteful number, since it uses less digits than its factorization.

20861341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140158.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20861341 is about 4567.4217015730. The cubic root of 20861341 is about 275.2838545634.

The spelling of 20861341 in words is "twenty million, eight hundred sixty-one thousand, three hundred forty-one".