21012880

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{239}}^1$

素因数の和:416

約数の個数: 80

約数和(自身を含む): 56424960

約数和(自身を除く): 35412080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 157, 239, 280, 314, 478, 560, 628, 785, 956, 1099, 1195, 1256, 1570, 1673, 1912, 2198, 2390, 2512, 3140, 3346, 3824, 4396, 4780, 5495, 6280, 6692, 8365, 8792, 9560, 10990, 12560, 13384, 16730, 17584, 19120, 21980, 26768, 33460, 37523, 43960, 66920, 75046, 87920, 133840, 150092, 187615, 262661, 300184, 375230, 525322, 600368, 750460, 1050644, 1313305, 1500920, 2101288, 2626610, 3001840, 4202576, 5253220, 10506440, 21012880]

約数ペア:

[(1, 21012880), (2, 10506440), (4, 5253220), (5, 4202576), (7, 3001840), (8, 2626610), (10, 2101288), (14, 1500920), (16, 1313305), (20, 1050644), (28, 750460), (35, 600368), (40, 525322), (56, 375230), (70, 300184), (80, 262661), (112, 187615), (140, 150092), (157, 133840), (239, 87920), (280, 75046), (314, 66920), (478, 43960), (560, 37523), (628, 33460), (785, 26768), (956, 21980), (1099, 19120), (1195, 17584), (1256, 16730), (1570, 13384), (1673, 12560), (1912, 10990), (2198, 9560), (2390, 8792), (2512, 8365), (3140, 6692), (3346, 6280), (3824, 5495), (4396, 4780)]