21067830

素因数分解:

$2^1\times 3^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1$

素因数の和:251

約数の個数: 128

約数和(自身を含む): 65525760

約数和(自身を除く): 44457930

約数列:

[1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 27, 30, 35, 42, 45, 54, 63, 70, 71, 90, 105, 126, 135, 142, 157, 189, 210, 213, 270, 314, 315, 355, 378, 426, 471, 497, 630, 639, 710, 785, 942, 945, 994, 1065, 1099, 1278, 1413, 1491, 1570, 1890, 1917, 2130, 2198, 2355, 2485, 2826, 2982, 3195, 3297, 3834, 4239, 4473, 4710, 4970, 5495, 6390, 6594, 7065, 7455, 8478, 8946, 9585, 9891, 10990, 11147, 13419, 14130, 14910, 16485, 19170, 19782, 21195, 22294, 22365, 26838, 29673, 32970, 33441, 42390, 44730, 49455, 55735, 59346, 66882, 67095, 78029, 98910, 100323, 111470, 134190, 148365, 156058, 167205, 200646, 234087, 296730, 300969, 334410, 390145, 468174, 501615, 601938, 702261, 780290, 1003230, 1170435, 1404522, 1504845, 2106783, 2340870, 3009690, 3511305, 4213566, 7022610, 10533915, 21067830]

約数ペア:

[(1, 21067830), (2, 10533915), (3, 7022610), (5, 4213566), (6, 3511305), (7, 3009690), (9, 2340870), (10, 2106783), (14, 1504845), (15, 1404522), (18, 1170435), (21, 1003230), (27, 780290), (30, 702261), (35, 601938), (42, 501615), (45, 468174), (54, 390145), (63, 334410), (70, 300969), (71, 296730), (90, 234087), (105, 200646), (126, 167205), (135, 156058), (142, 148365), (157, 134190), (189, 111470), (210, 100323), (213, 98910), (270, 78029), (314, 67095), (315, 66882), (355, 59346), (378, 55735), (426, 49455), (471, 44730), (497, 42390), (630, 33441), (639, 32970), (710, 29673), (785, 26838), (942, 22365), (945, 22294), (994, 21195), (1065, 19782), (1099, 19170), (1278, 16485), (1413, 14910), (1491, 14130), (1570, 13419), (1890, 11147), (1917, 10990), (2130, 9891), (2198, 9585), (2355, 8946), (2485, 8478), (2826, 7455), (2982, 7065), (3195, 6594), (3297, 6390), (3834, 5495), (4239, 4970), (4473, 4710)]