21201975

素因数分解:

$3^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{241}}^1$

素因数の和:297

約数の個数: 72

約数和(自身を含む): 42131232

約数和(自身を除く): 20929257

約数列:

[1, 3, 5, 9, 15, 17, 23, 25, 45, 51, 69, 75, 85, 115, 153, 207, 225, 241, 255, 345, 391, 425, 575, 723, 765, 1035, 1173, 1205, 1275, 1725, 1955, 2169, 3519, 3615, 3825, 4097, 5175, 5543, 5865, 6025, 9775, 10845, 12291, 16629, 17595, 18075, 20485, 27715, 29325, 36873, 49887, 54225, 61455, 83145, 87975, 94231, 102425, 138575, 184365, 249435, 282693, 307275, 415725, 471155, 848079, 921825, 1247175, 1413465, 2355775, 4240395, 7067325, 21201975]

約数ペア:

[(1, 21201975), (3, 7067325), (5, 4240395), (9, 2355775), (15, 1413465), (17, 1247175), (23, 921825), (25, 848079), (45, 471155), (51, 415725), (69, 307275), (75, 282693), (85, 249435), (115, 184365), (153, 138575), (207, 102425), (225, 94231), (241, 87975), (255, 83145), (345, 61455), (391, 54225), (425, 49887), (575, 36873), (723, 29325), (765, 27715), (1035, 20485), (1173, 18075), (1205, 17595), (1275, 16629), (1725, 12291), (1955, 10845), (2169, 9775), (3519, 6025), (3615, 5865), (3825, 5543), (4097, 5175)]