20008040

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{353}}^1$

素因数の和:486

約数の個数: 64

約数和(自身を含む): 49064400

約数和(自身を除く): 29056360

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 109, 130, 218, 260, 353, 436, 520, 545, 706, 872, 1090, 1412, 1417, 1765, 2180, 2824, 2834, 3530, 4360, 4589, 5668, 7060, 7085, 9178, 11336, 14120, 14170, 18356, 22945, 28340, 36712, 38477, 45890, 56680, 76954, 91780, 153908, 183560, 192385, 307816, 384770, 500201, 769540, 1000402, 1539080, 2000804, 2501005, 4001608, 5002010, 10004020, 20008040]

約数ペア:

[(1, 20008040), (2, 10004020), (4, 5002010), (5, 4001608), (8, 2501005), (10, 2000804), (13, 1539080), (20, 1000402), (26, 769540), (40, 500201), (52, 384770), (65, 307816), (104, 192385), (109, 183560), (130, 153908), (218, 91780), (260, 76954), (353, 56680), (436, 45890), (520, 38477), (545, 36712), (706, 28340), (872, 22945), (1090, 18356), (1412, 14170), (1417, 14120), (1765, 11336), (2180, 9178), (2824, 7085), (2834, 7060), (3530, 5668), (4360, 4589)]