21720720

素因数分解:

$2^4\times 3^1\times 5^1\times 7^2\times {\mathrm{1847}}^1$

素因数の和:1877

約数の個数: 120

約数和(自身を含む): 78369984

約数和(自身を除く): 56649264

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 49, 56, 60, 70, 80, 84, 98, 105, 112, 120, 140, 147, 168, 196, 210, 240, 245, 280, 294, 336, 392, 420, 490, 560, 588, 735, 784, 840, 980, 1176, 1470, 1680, 1847, 1960, 2352, 2940, 3694, 3920, 5541, 5880, 7388, 9235, 11082, 11760, 12929, 14776, 18470, 22164, 25858, 27705, 29552, 36940, 38787, 44328, 51716, 55410, 64645, 73880, 77574, 88656, 90503, 103432, 110820, 129290, 147760, 155148, 181006, 193935, 206864, 221640, 258580, 271509, 310296, 362012, 387870, 443280, 452515, 517160, 543018, 620592, 724024, 775740, 905030, 1034320, 1086036, 1357545, 1448048, 1551480, 1810060, 2172072, 2715090, 3102960, 3620120, 4344144, 5430180, 7240240, 10860360, 21720720]

約数ペア:

[(1, 21720720), (2, 10860360), (3, 7240240), (4, 5430180), (5, 4344144), (6, 3620120), (7, 3102960), (8, 2715090), (10, 2172072), (12, 1810060), (14, 1551480), (15, 1448048), (16, 1357545), (20, 1086036), (21, 1034320), (24, 905030), (28, 775740), (30, 724024), (35, 620592), (40, 543018), (42, 517160), (48, 452515), (49, 443280), (56, 387870), (60, 362012), (70, 310296), (80, 271509), (84, 258580), (98, 221640), (105, 206864), (112, 193935), (120, 181006), (140, 155148), (147, 147760), (168, 129290), (196, 110820), (210, 103432), (240, 90503), (245, 88656), (280, 77574), (294, 73880), (336, 64645), (392, 55410), (420, 51716), (490, 44328), (560, 38787), (588, 36940), (735, 29552), (784, 27705), (840, 25858), (980, 22164), (1176, 18470), (1470, 14776), (1680, 12929), (1847, 11760), (1960, 11082), (2352, 9235), (2940, 7388), (3694, 5880), (3920, 5541)]