21371480

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{563}}^1$

素因数の和:660

約数の個数: 64

約数和(自身を含む): 52587360

約数和(自身を除く): 31215880

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 73, 104, 130, 146, 260, 292, 365, 520, 563, 584, 730, 949, 1126, 1460, 1898, 2252, 2815, 2920, 3796, 4504, 4745, 5630, 7319, 7592, 9490, 11260, 14638, 18980, 22520, 29276, 36595, 37960, 41099, 58552, 73190, 82198, 146380, 164396, 205495, 292760, 328792, 410990, 534287, 821980, 1068574, 1643960, 2137148, 2671435, 4274296, 5342870, 10685740, 21371480]

約数ペア:

[(1, 21371480), (2, 10685740), (4, 5342870), (5, 4274296), (8, 2671435), (10, 2137148), (13, 1643960), (20, 1068574), (26, 821980), (40, 534287), (52, 410990), (65, 328792), (73, 292760), (104, 205495), (130, 164396), (146, 146380), (260, 82198), (292, 73190), (365, 58552), (520, 41099), (563, 37960), (584, 36595), (730, 29276), (949, 22520), (1126, 18980), (1460, 14638), (1898, 11260), (2252, 9490), (2815, 7592), (2920, 7319), (3796, 5630), (4504, 4745)]