20111541 has 4 divisors (see below), whose sum is σ = 26815392. Its totient is φ = 13407692.

The previous prime is 20111501. The next prime is 20111563. The reversal of 20111541 is 14511102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111541 - 2¹¹ = 20109493 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111501) 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, 3351921 + ... + 3351926.

It is an arithmetic number, because the mean of its divisors is an integer number (6703848).

Almost surely, 2^20111541 is an apocalyptic number.

It is an amenable number.

20111541 is a deficient number, since it is larger than the sum of its proper divisors (6703851).

20111541 is an equidigital number, since it uses as much as digits as its factorization.

20111541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703850.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 20111541 is about 4484.5892788526. The cubic root of 20111541 is about 271.9454412270.

Adding to 20111541 its reverse (14511102), we get a palindrome (34622643).

The spelling of 20111541 in words is "twenty million, one hundred eleven thousand, five hundred forty-one".