20213541 has 12 divisors (see below), whose sum is σ = 29242668. Its totient is φ = 13454784.

The previous prime is 20213503. The next prime is 20213563. The reversal of 20213541 is 14531202.

It can be written as a sum of positive squares in 2 ways, for example, as 2117025 + 18096516 = 1455^2 + 4254^2 .

It is not a de Polignac number, because 20213541 - 2¹¹ = 20211493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20214541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6361 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (2436889).

Almost surely, 2^20213541 is an apocalyptic number.

It is an amenable number.

20213541 is a deficient number, since it is larger than the sum of its proper divisors (9029127).

20213541 is a wasteful number, since it uses less digits than its factorization.

20213541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492 (or 3489 counting only the distinct ones).

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

The square root of 20213541 is about 4495.9471749566. The cubic root of 20213541 is about 272.4044094197.

Adding to 20213541 its reverse (14531202), we get a palindrome (34744743).

The spelling of 20213541 in words is "twenty million, two hundred thirteen thousand, five hundred forty-one".