21361275

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{109}}^1$

素因数の和:205

約数の個数: 72

約数和(自身を含む): 42202160

約数和(自身を除く): 20840885

約数列:

[1, 3, 5, 9, 13, 15, 25, 39, 45, 65, 67, 75, 109, 117, 195, 201, 225, 325, 327, 335, 545, 585, 603, 871, 975, 981, 1005, 1417, 1635, 1675, 2613, 2725, 2925, 3015, 4251, 4355, 4905, 5025, 7085, 7303, 7839, 8175, 12753, 13065, 15075, 21255, 21775, 21909, 24525, 35425, 36515, 39195, 63765, 65325, 65727, 94939, 106275, 109545, 182575, 195975, 284817, 318825, 328635, 474695, 547725, 854451, 1424085, 1643175, 2373475, 4272255, 7120425, 21361275]

約数ペア:

[(1, 21361275), (3, 7120425), (5, 4272255), (9, 2373475), (13, 1643175), (15, 1424085), (25, 854451), (39, 547725), (45, 474695), (65, 328635), (67, 318825), (75, 284817), (109, 195975), (117, 182575), (195, 109545), (201, 106275), (225, 94939), (325, 65727), (327, 65325), (335, 63765), (545, 39195), (585, 36515), (603, 35425), (871, 24525), (975, 21909), (981, 21775), (1005, 21255), (1417, 15075), (1635, 13065), (1675, 12753), (2613, 8175), (2725, 7839), (2925, 7303), (3015, 7085), (4251, 5025), (4355, 4905)]