20960381 has 8 divisors (see below), whose sum is σ = 22611960. Its totient is φ = 19314432.

The previous prime is 20960377. The next prime is 20960413. The reversal of 20960381 is 18306902.

It can be written as a sum of positive squares in 4 ways, for example, as 5428900 + 15531481 = 2330^2 + 3941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20960381 - 2² = 20960377 is a prime.

It is a super-2 number, since 2×20960381² = 878675143330322, which contains 22 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 (20960321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9521 + ... + 11513.

It is an arithmetic number, because the mean of its divisors is an integer number (2826495).

Almost surely, 2^20960381 is an apocalyptic number.

It is an amenable number.

20960381 is a deficient number, since it is larger than the sum of its proper divisors (1651579).

20960381 is a wasteful number, since it uses less digits than its factorization.

20960381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20960381 is about 4578.2508668704. The cubic root of 20960381 is about 275.7188071166.

The spelling of 20960381 in words is "twenty million, nine hundred sixty thousand, three hundred eighty-one".