21985964

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{19}}^1$

素因数の和:88

約数の個数: 144

約数和(自身を含む): 57765120

約数和(自身を除く): 35779156

約数列:

[1, 2, 4, 7, 11, 13, 14, 17, 19, 22, 26, 28, 34, 38, 44, 52, 68, 76, 77, 91, 119, 133, 143, 154, 182, 187, 209, 221, 238, 247, 266, 286, 289, 308, 323, 364, 374, 418, 442, 476, 494, 532, 572, 578, 646, 748, 836, 884, 988, 1001, 1156, 1292, 1309, 1463, 1547, 1729, 2002, 2023, 2261, 2431, 2618, 2717, 2926, 3094, 3179, 3458, 3553, 3757, 4004, 4046, 4199, 4522, 4862, 5236, 5434, 5491, 5852, 6188, 6358, 6916, 7106, 7514, 8092, 8398, 9044, 9724, 10868, 10982, 12716, 14212, 15028, 16796, 17017, 19019, 21964, 22253, 24871, 26299, 29393, 34034, 38038, 38437, 41327, 44506, 46189, 49742, 52598, 58786, 60401, 68068, 71383, 76076, 76874, 82654, 89012, 92378, 99484, 105196, 117572, 120802, 142766, 153748, 165308, 184756, 241604, 285532, 289289, 323323, 422807, 499681, 578578, 646646, 785213, 845614, 999362, 1157156, 1293292, 1570426, 1691228, 1998724, 3140852, 5496491, 10992982, 21985964]

約数ペア:

[(1, 21985964), (2, 10992982), (4, 5496491), (7, 3140852), (11, 1998724), (13, 1691228), (14, 1570426), (17, 1293292), (19, 1157156), (22, 999362), (26, 845614), (28, 785213), (34, 646646), (38, 578578), (44, 499681), (52, 422807), (68, 323323), (76, 289289), (77, 285532), (91, 241604), (119, 184756), (133, 165308), (143, 153748), (154, 142766), (182, 120802), (187, 117572), (209, 105196), (221, 99484), (238, 92378), (247, 89012), (266, 82654), (286, 76874), (289, 76076), (308, 71383), (323, 68068), (364, 60401), (374, 58786), (418, 52598), (442, 49742), (476, 46189), (494, 44506), (532, 41327), (572, 38437), (578, 38038), (646, 34034), (748, 29393), (836, 26299), (884, 24871), (988, 22253), (1001, 21964), (1156, 19019), (1292, 17017), (1309, 16796), (1463, 15028), (1547, 14212), (1729, 12716), (2002, 10982), (2023, 10868), (2261, 9724), (2431, 9044), (2618, 8398), (2717, 8092), (2926, 7514), (3094, 7106), (3179, 6916), (3458, 6358), (3553, 6188), (3757, 5852), (4004, 5491), (4046, 5434), (4199, 5236), (4522, 4862)]