20386840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{401}}^1$

素因数の和:484

約数の個数: 64

約数和(自身を含む): 48625920

約数和(自身を除く): 28239080

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 41, 62, 82, 124, 155, 164, 205, 248, 310, 328, 401, 410, 620, 802, 820, 1240, 1271, 1604, 1640, 2005, 2542, 3208, 4010, 5084, 6355, 8020, 10168, 12431, 12710, 16040, 16441, 24862, 25420, 32882, 49724, 50840, 62155, 65764, 82205, 99448, 124310, 131528, 164410, 248620, 328820, 497240, 509671, 657640, 1019342, 2038684, 2548355, 4077368, 5096710, 10193420, 20386840]

約数ペア:

[(1, 20386840), (2, 10193420), (4, 5096710), (5, 4077368), (8, 2548355), (10, 2038684), (20, 1019342), (31, 657640), (40, 509671), (41, 497240), (62, 328820), (82, 248620), (124, 164410), (155, 131528), (164, 124310), (205, 99448), (248, 82205), (310, 65764), (328, 62155), (401, 50840), (410, 49724), (620, 32882), (802, 25420), (820, 24862), (1240, 16441), (1271, 16040), (1604, 12710), (1640, 12431), (2005, 10168), (2542, 8020), (3208, 6355), (4010, 5084)]