20791541 has 4 divisors (see below), whose sum is σ = 21144000. Its totient is φ = 20439084.

The previous prime is 20791523. The next prime is 20791543. The reversal of 20791541 is 14519702.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14519702 = 2 ⋅7259851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20791541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791543) 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 3 ways as a sum of consecutive naturals, for example, 176141 + ... + 176258.

It is an arithmetic number, because the mean of its divisors is an integer number (5286000).

Almost surely, 2^20791541 is an apocalyptic number.

It is an amenable number.

20791541 is a deficient number, since it is larger than the sum of its proper divisors (352459).

20791541 is an equidigital number, since it uses as much as digits as its factorization.

20791541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352458.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20791541 is about 4559.7742268669. The cubic root of 20791541 is about 274.9764872459.

The spelling of 20791541 in words is "twenty million, seven hundred ninety-one thousand, five hundred forty-one".