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20671541 = 1117110543
BaseRepresentation
bin100111011011…
…0110000110101
31102220020000122
41032312300311
520242442131
62015021325
7340463612
oct116666065
942806018
1020671541
1110739920
126b0a845
134389ca7
142a61509
151c34d7b
hex13b6c35

20671541 has 8 divisors (see below), whose sum is σ = 23877504. Its totient is φ = 17686720.

The previous prime is 20671531. The next prime is 20671543. The reversal of 20671541 is 14517602.

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 20671541 - 26 = 20671477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20671541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55085 + ... + 55458.

It is an arithmetic number, because the mean of its divisors is an integer number (2984688).

Almost surely, 220671541 is an apocalyptic number.

It is an amenable number.

20671541 is a deficient number, since it is larger than the sum of its proper divisors (3205963).

20671541 is a wasteful number, since it uses less digits than its factorization.

20671541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110571.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20671541 is about 4546.5966392457. The cubic root of 20671541 is about 274.4464501387.

It can be divided in two parts, 20671 and 541, that added together give a palindrome (21212).

The spelling of 20671541 in words is "twenty million, six hundred seventy-one thousand, five hundred forty-one".

Divisors: 1 11 17 187 110543 1215973 1879231 20671541