20017920

素因数分解:

$2^8\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{401}}^1$

素因数の和:438

約数の個数: 144

約数和(自身を含む): 69021792

約数和(自身を除く): 49003872

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, 401, 416, 480, 520, 624, 640, 768, 780, 802, 832, 960, 1040, 1203, 1248, 1280, 1560, 1604, 1664, 1920, 2005, 2080, 2406, 2496, 3120, 3208, 3328, 3840, 4010, 4160, 4812, 4992, 5213, 6015, 6240, 6416, 8020, 8320, 9624, 9984, 10426, 12030, 12480, 12832, 15639, 16040, 16640, 19248, 20852, 24060, 24960, 25664, 26065, 31278, 32080, 38496, 41704, 48120, 49920, 51328, 52130, 62556, 64160, 76992, 78195, 83408, 96240, 102656, 104260, 125112, 128320, 153984, 156390, 166816, 192480, 208520, 250224, 256640, 307968, 312780, 333632, 384960, 417040, 500448, 513280, 625560, 667264, 769920, 834080, 1000896, 1251120, 1334528, 1539840, 1668160, 2001792, 2502240, 3336320, 4003584, 5004480, 6672640, 10008960, 20017920]

約数ペア:

[(1, 20017920), (2, 10008960), (3, 6672640), (4, 5004480), (5, 4003584), (6, 3336320), (8, 2502240), (10, 2001792), (12, 1668160), (13, 1539840), (15, 1334528), (16, 1251120), (20, 1000896), (24, 834080), (26, 769920), (30, 667264), (32, 625560), (39, 513280), (40, 500448), (48, 417040), (52, 384960), (60, 333632), (64, 312780), (65, 307968), (78, 256640), (80, 250224), (96, 208520), (104, 192480), (120, 166816), (128, 156390), (130, 153984), (156, 128320), (160, 125112), (192, 104260), (195, 102656), (208, 96240), (240, 83408), (256, 78195), (260, 76992), (312, 64160), (320, 62556), (384, 52130), (390, 51328), (401, 49920), (416, 48120), (480, 41704), (520, 38496), (624, 32080), (640, 31278), (768, 26065), (780, 25664), (802, 24960), (832, 24060), (960, 20852), (1040, 19248), (1203, 16640), (1248, 16040), (1280, 15639), (1560, 12832), (1604, 12480), (1664, 12030), (1920, 10426), (2005, 9984), (2080, 9624), (2406, 8320), (2496, 8020), (3120, 6416), (3208, 6240), (3328, 6015), (3840, 5213), (4010, 4992), (4160, 4812)]