20001880

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{401}}^1$

素因数の和:484

約数の個数: 64

約数和(自身を含む): 47757600

約数和(自身を除く): 27755720

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 43, 58, 86, 116, 145, 172, 215, 232, 290, 344, 401, 430, 580, 802, 860, 1160, 1247, 1604, 1720, 2005, 2494, 3208, 4010, 4988, 6235, 8020, 9976, 11629, 12470, 16040, 17243, 23258, 24940, 34486, 46516, 49880, 58145, 68972, 86215, 93032, 116290, 137944, 172430, 232580, 344860, 465160, 500047, 689720, 1000094, 2000188, 2500235, 4000376, 5000470, 10000940, 20001880]

約数ペア:

[(1, 20001880), (2, 10000940), (4, 5000470), (5, 4000376), (8, 2500235), (10, 2000188), (20, 1000094), (29, 689720), (40, 500047), (43, 465160), (58, 344860), (86, 232580), (116, 172430), (145, 137944), (172, 116290), (215, 93032), (232, 86215), (290, 68972), (344, 58145), (401, 49880), (430, 46516), (580, 34486), (802, 24940), (860, 23258), (1160, 17243), (1247, 16040), (1604, 12470), (1720, 11629), (2005, 9976), (2494, 8020), (3208, 6235), (4010, 4988)]