21390720

素因数分解:

$2^7\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{857}}^1$

素因数の和:892

約数の個数: 128

約数和(自身を含む): 73513440

約数和(自身を除く): 52122720

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 32, 39, 40, 48, 52, 60, 64, 65, 78, 80, 96, 104, 120, 128, 130, 156, 160, 192, 195, 208, 240, 260, 312, 320, 384, 390, 416, 480, 520, 624, 640, 780, 832, 857, 960, 1040, 1248, 1560, 1664, 1714, 1920, 2080, 2496, 2571, 3120, 3428, 4160, 4285, 4992, 5142, 6240, 6856, 8320, 8570, 10284, 11141, 12480, 12855, 13712, 17140, 20568, 22282, 24960, 25710, 27424, 33423, 34280, 41136, 44564, 51420, 54848, 55705, 66846, 68560, 82272, 89128, 102840, 109696, 111410, 133692, 137120, 164544, 167115, 178256, 205680, 222820, 267384, 274240, 329088, 334230, 356512, 411360, 445640, 534768, 548480, 668460, 713024, 822720, 891280, 1069536, 1336920, 1426048, 1645440, 1782560, 2139072, 2673840, 3565120, 4278144, 5347680, 7130240, 10695360, 21390720]

約数ペア:

[(1, 21390720), (2, 10695360), (3, 7130240), (4, 5347680), (5, 4278144), (6, 3565120), (8, 2673840), (10, 2139072), (12, 1782560), (13, 1645440), (15, 1426048), (16, 1336920), (20, 1069536), (24, 891280), (26, 822720), (30, 713024), (32, 668460), (39, 548480), (40, 534768), (48, 445640), (52, 411360), (60, 356512), (64, 334230), (65, 329088), (78, 274240), (80, 267384), (96, 222820), (104, 205680), (120, 178256), (128, 167115), (130, 164544), (156, 137120), (160, 133692), (192, 111410), (195, 109696), (208, 102840), (240, 89128), (260, 82272), (312, 68560), (320, 66846), (384, 55705), (390, 54848), (416, 51420), (480, 44564), (520, 41136), (624, 34280), (640, 33423), (780, 27424), (832, 25710), (857, 24960), (960, 22282), (1040, 20568), (1248, 17140), (1560, 13712), (1664, 12855), (1714, 12480), (1920, 11141), (2080, 10284), (2496, 8570), (2571, 8320), (3120, 6856), (3428, 6240), (4160, 5142), (4285, 4992)]