21189520

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^3\times {\mathrm{199}}^1$

素因数の和:245

約数の個数: 80

約数和(自身を含む): 54460800

約数和(自身を除く): 33271280

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 121, 176, 199, 220, 242, 398, 440, 484, 605, 796, 880, 968, 995, 1210, 1331, 1592, 1936, 1990, 2189, 2420, 2662, 3184, 3980, 4378, 4840, 5324, 6655, 7960, 8756, 9680, 10648, 10945, 13310, 15920, 17512, 21296, 21890, 24079, 26620, 35024, 43780, 48158, 53240, 87560, 96316, 106480, 120395, 175120, 192632, 240790, 264869, 385264, 481580, 529738, 963160, 1059476, 1324345, 1926320, 2118952, 2648690, 4237904, 5297380, 10594760, 21189520]

約数ペア:

[(1, 21189520), (2, 10594760), (4, 5297380), (5, 4237904), (8, 2648690), (10, 2118952), (11, 1926320), (16, 1324345), (20, 1059476), (22, 963160), (40, 529738), (44, 481580), (55, 385264), (80, 264869), (88, 240790), (110, 192632), (121, 175120), (176, 120395), (199, 106480), (220, 96316), (242, 87560), (398, 53240), (440, 48158), (484, 43780), (605, 35024), (796, 26620), (880, 24079), (968, 21890), (995, 21296), (1210, 17512), (1331, 15920), (1592, 13310), (1936, 10945), (1990, 10648), (2189, 9680), (2420, 8756), (2662, 7960), (3184, 6655), (3980, 5324), (4378, 4840)]