21686665

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{619}}^1$

素因数の和:662

約数の個数: 48

約数和(自身を含む): 35622720

約数和(自身を除く): 13936055

約数列:

[1, 5, 7, 11, 13, 35, 49, 55, 65, 77, 91, 143, 245, 385, 455, 539, 619, 637, 715, 1001, 2695, 3095, 3185, 4333, 5005, 6809, 7007, 8047, 21665, 30331, 34045, 35035, 40235, 47663, 56329, 88517, 151655, 238315, 281645, 333641, 394303, 442585, 619619, 1668205, 1971515, 3098095, 4337333, 21686665]

約数ペア:

[(1, 21686665), (5, 4337333), (7, 3098095), (11, 1971515), (13, 1668205), (35, 619619), (49, 442585), (55, 394303), (65, 333641), (77, 281645), (91, 238315), (143, 151655), (245, 88517), (385, 56329), (455, 47663), (539, 40235), (619, 35035), (637, 34045), (715, 30331), (1001, 21665), (2695, 8047), (3095, 7007), (3185, 6809), (4333, 5005)]