20939541 has 8 divisors (see below), whose sum is σ = 31907904. Its totient is φ = 11965440.

The previous prime is 20939519. The next prime is 20939543. The reversal of 20939541 is 14593902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20939541 - 2¹³ = 20931349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939543) 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 7 ways as a sum of consecutive naturals, for example, 498540 + ... + 498581.

It is an arithmetic number, because the mean of its divisors is an integer number (3988488).

Almost surely, 2^20939541 is an apocalyptic number.

20939541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20939541 is a deficient number, since it is larger than the sum of its proper divisors (10968363).

20939541 is an equidigital number, since it uses as much as digits as its factorization.

20939541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997131.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20939541 is about 4575.9743224804. The cubic root of 20939541 is about 275.6273983882.

The spelling of 20939541 in words is "twenty million, nine hundred thirty-nine thousand, five hundred forty-one".