21528975

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{311}}^1$

素因数の和:408

約数の個数: 48

約数和(自身を含む): 38997504

約数和(自身を除く): 17468529

約数列:

[1, 3, 5, 13, 15, 25, 39, 65, 71, 75, 195, 213, 311, 325, 355, 923, 933, 975, 1065, 1555, 1775, 2769, 4043, 4615, 4665, 5325, 7775, 12129, 13845, 20215, 22081, 23075, 23325, 60645, 66243, 69225, 101075, 110405, 287053, 303225, 331215, 552025, 861159, 1435265, 1656075, 4305795, 7176325, 21528975]

約数ペア:

[(1, 21528975), (3, 7176325), (5, 4305795), (13, 1656075), (15, 1435265), (25, 861159), (39, 552025), (65, 331215), (71, 303225), (75, 287053), (195, 110405), (213, 101075), (311, 69225), (325, 66243), (355, 60645), (923, 23325), (933, 23075), (975, 22081), (1065, 20215), (1555, 13845), (1775, 12129), (2769, 7775), (4043, 5325), (4615, 4665)]