20541321 has 12 divisors (see below), whose sum is σ = 31416372. Its totient is φ = 12888576.

The previous prime is 20541317. The next prime is 20541331. The reversal of 20541321 is 12314502.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 13838400 = 2589^2 + 3720^2 .

It is not a de Polignac number, because 20541321 - 2² = 20541317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20541294 and 20541303.

It is not an unprimeable number, because it can be changed into a prime (20541331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66976 + ... + 67281.

It is an arithmetic number, because the mean of its divisors is an integer number (2618031).

Almost surely, 2^20541321 is an apocalyptic number.

It is an amenable number.

20541321 is a deficient number, since it is larger than the sum of its proper divisors (10875051).

20541321 is a wasteful number, since it uses less digits than its factorization.

20541321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134280 (or 134277 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20541321 is about 4532.2534130386. The cubic root of 20541321 is about 273.8689456204.

Adding to 20541321 its reverse (12314502), we get a palindrome (32855823).

It can be divided in two parts, 2054 and 1321, that added together give a cube (3375 = 15³).

The spelling of 20541321 in words is "twenty million, five hundred forty-one thousand, three hundred twenty-one".