28278520

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{401}}^1$

素因数の和:496

約数の個数: 64

約数和(自身を含む): 66860640

約数和(自身を除く): 38582120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 43, 82, 86, 164, 172, 205, 215, 328, 344, 401, 410, 430, 802, 820, 860, 1604, 1640, 1720, 1763, 2005, 3208, 3526, 4010, 7052, 8020, 8815, 14104, 16040, 16441, 17243, 17630, 32882, 34486, 35260, 65764, 68972, 70520, 82205, 86215, 131528, 137944, 164410, 172430, 328820, 344860, 657640, 689720, 706963, 1413926, 2827852, 3534815, 5655704, 7069630, 14139260, 28278520]

約数ペア:

[(1, 28278520), (2, 14139260), (4, 7069630), (5, 5655704), (8, 3534815), (10, 2827852), (20, 1413926), (40, 706963), (41, 689720), (43, 657640), (82, 344860), (86, 328820), (164, 172430), (172, 164410), (205, 137944), (215, 131528), (328, 86215), (344, 82205), (401, 70520), (410, 68972), (430, 65764), (802, 35260), (820, 34486), (860, 32882), (1604, 17630), (1640, 17243), (1720, 16441), (1763, 16040), (2005, 14104), (3208, 8815), (3526, 8020), (4010, 7052)]