21313665

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{251}}^1$

素因数の和:319

約数の個数: 64

約数和(自身を含む): 41368320

約数和(自身を除く): 20054655

約数列:

[1, 3, 5, 9, 15, 17, 27, 37, 45, 51, 85, 111, 135, 153, 185, 251, 255, 333, 459, 555, 629, 753, 765, 999, 1255, 1665, 1887, 2259, 2295, 3145, 3765, 4267, 4995, 5661, 6777, 9287, 9435, 11295, 12801, 16983, 21335, 27861, 28305, 33885, 38403, 46435, 64005, 83583, 84915, 115209, 139305, 157879, 192015, 250749, 417915, 473637, 576045, 789395, 1253745, 1420911, 2368185, 4262733, 7104555, 21313665]

約数ペア:

[(1, 21313665), (3, 7104555), (5, 4262733), (9, 2368185), (15, 1420911), (17, 1253745), (27, 789395), (37, 576045), (45, 473637), (51, 417915), (85, 250749), (111, 192015), (135, 157879), (153, 139305), (185, 115209), (251, 84915), (255, 83583), (333, 64005), (459, 46435), (555, 38403), (629, 33885), (753, 28305), (765, 27861), (999, 21335), (1255, 16983), (1665, 12801), (1887, 11295), (2259, 9435), (2295, 9287), (3145, 6777), (3765, 5661), (4267, 4995)]