21408240

素因数分解:

$2^4\times 3^1\times 5^1\times 7^1\times {\mathrm{12743}}^1$

素因数の和:12766

約数の個数: 80

約数和(自身を含む): 75852288

約数和(自身を除く): 54444048

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, 56, 60, 70, 80, 84, 105, 112, 120, 140, 168, 210, 240, 280, 336, 420, 560, 840, 1680, 12743, 25486, 38229, 50972, 63715, 76458, 89201, 101944, 127430, 152916, 178402, 191145, 203888, 254860, 267603, 305832, 356804, 382290, 446005, 509720, 535206, 611664, 713608, 764580, 892010, 1019440, 1070412, 1338015, 1427216, 1529160, 1784020, 2140824, 2676030, 3058320, 3568040, 4281648, 5352060, 7136080, 10704120, 21408240]

約数ペア:

[(1, 21408240), (2, 10704120), (3, 7136080), (4, 5352060), (5, 4281648), (6, 3568040), (7, 3058320), (8, 2676030), (10, 2140824), (12, 1784020), (14, 1529160), (15, 1427216), (16, 1338015), (20, 1070412), (21, 1019440), (24, 892010), (28, 764580), (30, 713608), (35, 611664), (40, 535206), (42, 509720), (48, 446005), (56, 382290), (60, 356804), (70, 305832), (80, 267603), (84, 254860), (105, 203888), (112, 191145), (120, 178402), (140, 152916), (168, 127430), (210, 101944), (240, 89201), (280, 76458), (336, 63715), (420, 50972), (560, 38229), (840, 25486), (1680, 12743)]