20212541 has 4 divisors (see below), whose sum is σ = 21401532. Its totient is φ = 19023552.

The previous prime is 20212531. The next prime is 20212547. The reversal of 20212541 is 14521202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14521202 = 2 ⋅7260601.

It can be written as a sum of positive squares in 2 ways, for example, as 14853316 + 5359225 = 3854^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212541 - 2⁶ = 20212477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1188973 = 20212541 / (2 + 0 + 2 + 1 + 2 + 5 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212547) 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, 594470 + ... + 594503.

It is an arithmetic number, because the mean of its divisors is an integer number (5350383).

Almost surely, 2^20212541 is an apocalyptic number.

It is an amenable number.

20212541 is a deficient number, since it is larger than the sum of its proper divisors (1188991).

20212541 is a wasteful number, since it uses less digits than its factorization.

20212541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188990.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20212541 is about 4495.8359623100. The cubic root of 20212541 is about 272.3999172346.

Adding to 20212541 its reverse (14521202), we get a palindrome (34733743).

The spelling of 20212541 in words is "twenty million, two hundred twelve thousand, five hundred forty-one".