20971541 has 8 divisors (see below), whose sum is σ = 21942144. Its totient is φ = 20022880.

The previous prime is 20971537. The next prime is 20971567. The reversal of 20971541 is 14517902.

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

It is a cyclic number.

It is not a de Polignac number, because 20971541 - 2² = 20971537 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3515 + ... + 7368.

It is an arithmetic number, because the mean of its divisors is an integer number (2742768).

Almost surely, 2^20971541 is an apocalyptic number.

It is an amenable number.

20971541 is a deficient number, since it is larger than the sum of its proper divisors (970603).

20971541 is a wasteful number, since it uses less digits than its factorization.

20971541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10971.

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

The square root of 20971541 is about 4579.4695107621. The cubic root of 20971541 is about 275.7677323714.

It can be divided in two parts, 20971 and 541, that added together give a palindrome (21512).

The spelling of 20971541 in words is "twenty million, nine hundred seventy-one thousand, five hundred forty-one".