21008520

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^2$

素因数の和:164

約数の個数: 144

約数和(自身を含む): 74643660

約数和(自身を除く): 53635140

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 18, 20, 24, 26, 30, 36, 39, 40, 45, 52, 60, 65, 67, 72, 78, 90, 104, 117, 120, 130, 134, 156, 180, 195, 201, 234, 260, 268, 312, 335, 360, 390, 402, 468, 520, 536, 585, 603, 670, 780, 804, 871, 936, 1005, 1170, 1206, 1340, 1560, 1608, 1742, 2010, 2340, 2412, 2613, 2680, 3015, 3484, 4020, 4355, 4489, 4680, 4824, 5226, 6030, 6968, 7839, 8040, 8710, 8978, 10452, 12060, 13065, 13467, 15678, 17420, 17956, 20904, 22445, 24120, 26130, 26934, 31356, 34840, 35912, 39195, 40401, 44890, 52260, 53868, 58357, 62712, 67335, 78390, 80802, 89780, 104520, 107736, 116714, 134670, 156780, 161604, 175071, 179560, 202005, 233428, 269340, 291785, 313560, 323208, 350142, 404010, 466856, 525213, 538680, 583570, 700284, 808020, 875355, 1050426, 1167140, 1400568, 1616040, 1750710, 2100852, 2334280, 2626065, 3501420, 4201704, 5252130, 7002840, 10504260, 21008520]

約数ペア:

[(1, 21008520), (2, 10504260), (3, 7002840), (4, 5252130), (5, 4201704), (6, 3501420), (8, 2626065), (9, 2334280), (10, 2100852), (12, 1750710), (13, 1616040), (15, 1400568), (18, 1167140), (20, 1050426), (24, 875355), (26, 808020), (30, 700284), (36, 583570), (39, 538680), (40, 525213), (45, 466856), (52, 404010), (60, 350142), (65, 323208), (67, 313560), (72, 291785), (78, 269340), (90, 233428), (104, 202005), (117, 179560), (120, 175071), (130, 161604), (134, 156780), (156, 134670), (180, 116714), (195, 107736), (201, 104520), (234, 89780), (260, 80802), (268, 78390), (312, 67335), (335, 62712), (360, 58357), (390, 53868), (402, 52260), (468, 44890), (520, 40401), (536, 39195), (585, 35912), (603, 34840), (670, 31356), (780, 26934), (804, 26130), (871, 24120), (936, 22445), (1005, 20904), (1170, 17956), (1206, 17420), (1340, 15678), (1560, 13467), (1608, 13065), (1742, 12060), (2010, 10452), (2340, 8978), (2412, 8710), (2613, 8040), (2680, 7839), (3015, 6968), (3484, 6030), (4020, 5226), (4355, 4824), (4489, 4680)]