21131808775

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{645739}}^1$

素因数の和:645784

約数の個数: 48

約数和(自身を含む): 34591000320

約数和(自身を除く): 13459191545

約数列:

[1, 5, 7, 11, 17, 25, 35, 55, 77, 85, 119, 175, 187, 275, 385, 425, 595, 935, 1309, 1925, 2975, 4675, 6545, 32725, 645739, 3228695, 4520173, 7103129, 10977563, 16143475, 22600865, 35515645, 49721903, 54887815, 76842941, 113004325, 120753193, 177578225, 248609515, 274439075, 384214705, 603765965, 845272351, 1243047575, 1921073525, 3018829825, 4226361755, 21131808775]

約数ペア:

[(1, 21131808775), (5, 4226361755), (7, 3018829825), (11, 1921073525), (17, 1243047575), (25, 845272351), (35, 603765965), (55, 384214705), (77, 274439075), (85, 248609515), (119, 177578225), (175, 120753193), (187, 113004325), (275, 76842941), (385, 54887815), (425, 49721903), (595, 35515645), (935, 22600865), (1309, 16143475), (1925, 10977563), (2975, 7103129), (4675, 4520173), (6545, 3228695), (32725, 645739)]