20408960

素因数分解:

$2^7\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{223}}^1$

素因数の和:266

約数の個数: 128

約数和(自身を含む): 57576960

約数和(自身を除く): 37168000

約数列:

[1, 2, 4, 5, 8, 10, 11, 13, 16, 20, 22, 26, 32, 40, 44, 52, 55, 64, 65, 80, 88, 104, 110, 128, 130, 143, 160, 176, 208, 220, 223, 260, 286, 320, 352, 416, 440, 446, 520, 572, 640, 704, 715, 832, 880, 892, 1040, 1115, 1144, 1408, 1430, 1664, 1760, 1784, 2080, 2230, 2288, 2453, 2860, 2899, 3520, 3568, 4160, 4460, 4576, 4906, 5720, 5798, 7040, 7136, 8320, 8920, 9152, 9812, 11440, 11596, 12265, 14272, 14495, 17840, 18304, 19624, 22880, 23192, 24530, 28544, 28990, 31889, 35680, 39248, 45760, 46384, 49060, 57980, 63778, 71360, 78496, 91520, 92768, 98120, 115960, 127556, 142720, 156992, 159445, 185536, 196240, 231920, 255112, 313984, 318890, 371072, 392480, 463840, 510224, 637780, 784960, 927680, 1020448, 1275560, 1569920, 1855360, 2040896, 2551120, 4081792, 5102240, 10204480, 20408960]

約数ペア:

[(1, 20408960), (2, 10204480), (4, 5102240), (5, 4081792), (8, 2551120), (10, 2040896), (11, 1855360), (13, 1569920), (16, 1275560), (20, 1020448), (22, 927680), (26, 784960), (32, 637780), (40, 510224), (44, 463840), (52, 392480), (55, 371072), (64, 318890), (65, 313984), (80, 255112), (88, 231920), (104, 196240), (110, 185536), (128, 159445), (130, 156992), (143, 142720), (160, 127556), (176, 115960), (208, 98120), (220, 92768), (223, 91520), (260, 78496), (286, 71360), (320, 63778), (352, 57980), (416, 49060), (440, 46384), (446, 45760), (520, 39248), (572, 35680), (640, 31889), (704, 28990), (715, 28544), (832, 24530), (880, 23192), (892, 22880), (1040, 19624), (1115, 18304), (1144, 17840), (1408, 14495), (1430, 14272), (1664, 12265), (1760, 11596), (1784, 11440), (2080, 9812), (2230, 9152), (2288, 8920), (2453, 8320), (2860, 7136), (2899, 7040), (3520, 5798), (3568, 5720), (4160, 4906), (4460, 4576)]