21016320

素因数分解:

$2^8\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{421}}^1$

素因数の和:458

約数の個数: 144

約数和(自身を含む): 72455712

約数和(自身を除く): 51439392

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, 256, 260, 312, 320, 384, 390, 416, 421, 480, 520, 624, 640, 768, 780, 832, 842, 960, 1040, 1248, 1263, 1280, 1560, 1664, 1684, 1920, 2080, 2105, 2496, 2526, 3120, 3328, 3368, 3840, 4160, 4210, 4992, 5052, 5473, 6240, 6315, 6736, 8320, 8420, 9984, 10104, 10946, 12480, 12630, 13472, 16419, 16640, 16840, 20208, 21892, 24960, 25260, 26944, 27365, 32838, 33680, 40416, 43784, 49920, 50520, 53888, 54730, 65676, 67360, 80832, 82095, 87568, 101040, 107776, 109460, 131352, 134720, 161664, 164190, 175136, 202080, 218920, 262704, 269440, 323328, 328380, 350272, 404160, 437840, 525408, 538880, 656760, 700544, 808320, 875680, 1050816, 1313520, 1401088, 1616640, 1751360, 2101632, 2627040, 3502720, 4203264, 5254080, 7005440, 10508160, 21016320]

約数ペア:

[(1, 21016320), (2, 10508160), (3, 7005440), (4, 5254080), (5, 4203264), (6, 3502720), (8, 2627040), (10, 2101632), (12, 1751360), (13, 1616640), (15, 1401088), (16, 1313520), (20, 1050816), (24, 875680), (26, 808320), (30, 700544), (32, 656760), (39, 538880), (40, 525408), (48, 437840), (52, 404160), (60, 350272), (64, 328380), (65, 323328), (78, 269440), (80, 262704), (96, 218920), (104, 202080), (120, 175136), (128, 164190), (130, 161664), (156, 134720), (160, 131352), (192, 109460), (195, 107776), (208, 101040), (240, 87568), (256, 82095), (260, 80832), (312, 67360), (320, 65676), (384, 54730), (390, 53888), (416, 50520), (421, 49920), (480, 43784), (520, 40416), (624, 33680), (640, 32838), (768, 27365), (780, 26944), (832, 25260), (842, 24960), (960, 21892), (1040, 20208), (1248, 16840), (1263, 16640), (1280, 16419), (1560, 13472), (1664, 12630), (1684, 12480), (1920, 10946), (2080, 10104), (2105, 9984), (2496, 8420), (2526, 8320), (3120, 6736), (3328, 6315), (3368, 6240), (3840, 5473), (4160, 5052), (4210, 4992)]