21178017

素因数分解:

$3^4\times 7^1\times {\mathrm{41}}^1\times {\mathrm{911}}^1$

素因数の和:971

約数の個数: 40

約数和(自身を含む): 37078272

約数和(自身を除く): 15900255

約数列:

[1, 3, 7, 9, 21, 27, 41, 63, 81, 123, 189, 287, 369, 567, 861, 911, 1107, 2583, 2733, 3321, 6377, 7749, 8199, 19131, 23247, 24597, 37351, 57393, 73791, 112053, 172179, 261457, 336159, 516537, 784371, 1008477, 2353113, 3025431, 7059339, 21178017]

約数ペア:

[(1, 21178017), (3, 7059339), (7, 3025431), (9, 2353113), (21, 1008477), (27, 784371), (41, 516537), (63, 336159), (81, 261457), (123, 172179), (189, 112053), (287, 73791), (369, 57393), (567, 37351), (861, 24597), (911, 23247), (1107, 19131), (2583, 8199), (2733, 7749), (3321, 6377)]