21287880

素因数分解:

$2^3\times 3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{857}}^1$

素因数の和:900

約数の個数: 128

約数和(自身を含む): 74131200

約数和(自身を除く): 52843320

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 23, 24, 27, 30, 36, 40, 45, 46, 54, 60, 69, 72, 90, 92, 108, 115, 120, 135, 138, 180, 184, 207, 216, 230, 270, 276, 345, 360, 414, 460, 540, 552, 621, 690, 828, 857, 920, 1035, 1080, 1242, 1380, 1656, 1714, 2070, 2484, 2571, 2760, 3105, 3428, 4140, 4285, 4968, 5142, 6210, 6856, 7713, 8280, 8570, 10284, 12420, 12855, 15426, 17140, 19711, 20568, 23139, 24840, 25710, 30852, 34280, 38565, 39422, 46278, 51420, 59133, 61704, 77130, 78844, 92556, 98555, 102840, 115695, 118266, 154260, 157688, 177399, 185112, 197110, 231390, 236532, 295665, 308520, 354798, 394220, 462780, 473064, 532197, 591330, 709596, 788440, 886995, 925560, 1064394, 1182660, 1419192, 1773990, 2128788, 2365320, 2660985, 3547980, 4257576, 5321970, 7095960, 10643940, 21287880]

約数ペア:

[(1, 21287880), (2, 10643940), (3, 7095960), (4, 5321970), (5, 4257576), (6, 3547980), (8, 2660985), (9, 2365320), (10, 2128788), (12, 1773990), (15, 1419192), (18, 1182660), (20, 1064394), (23, 925560), (24, 886995), (27, 788440), (30, 709596), (36, 591330), (40, 532197), (45, 473064), (46, 462780), (54, 394220), (60, 354798), (69, 308520), (72, 295665), (90, 236532), (92, 231390), (108, 197110), (115, 185112), (120, 177399), (135, 157688), (138, 154260), (180, 118266), (184, 115695), (207, 102840), (216, 98555), (230, 92556), (270, 78844), (276, 77130), (345, 61704), (360, 59133), (414, 51420), (460, 46278), (540, 39422), (552, 38565), (621, 34280), (690, 30852), (828, 25710), (857, 24840), (920, 23139), (1035, 20568), (1080, 19711), (1242, 17140), (1380, 15426), (1656, 12855), (1714, 12420), (2070, 10284), (2484, 8570), (2571, 8280), (2760, 7713), (3105, 6856), (3428, 6210), (4140, 5142), (4285, 4968)]