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20891135 = 534712041
BaseRepresentation
bin100111110110…
…0010111111111
31110022101020202
41033230113333
520322004020
62023434115
7342400046
oct117542777
943271222
1020891135
1110879901
126bb593b
134435c25
142abb55d
151c79e75
hex13ec5ff

20891135 has 8 divisors (see below), whose sum is σ = 25143696. Its totient is φ = 16663360.

The previous prime is 20891131. The next prime is 20891149. The reversal of 20891135 is 53119802.

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

It is not a de Polignac number, because 20891135 - 22 = 20891131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20891098 and 20891107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891131) 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, 4286 + ... + 7755.

It is an arithmetic number, because the mean of its divisors is an integer number (3142962).

It is the magic constant of a 347 × 347 magic square.

Almost surely, 220891135 is an apocalyptic number.

20891135 is a deficient number, since it is larger than the sum of its proper divisors (4252561).

20891135 is a wasteful number, since it uses less digits than its factorization.

20891135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12393.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 20891135 is about 4570.6821153959. The cubic root of 20891135 is about 275.4148449548.

The spelling of 20891135 in words is "twenty million, eight hundred ninety-one thousand, one hundred thirty-five".

Divisors: 1 5 347 1735 12041 60205 4178227 20891135