19915857

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{31}}^1$

素因数の和:103

約数の個数: 72

約数和(自身を含む): 35759360

約数和(自身を除く): 15843503

約数列:

[1, 3, 9, 13, 17, 19, 31, 39, 51, 57, 93, 117, 153, 171, 221, 247, 279, 289, 323, 403, 527, 589, 663, 741, 867, 969, 1209, 1581, 1767, 1989, 2223, 2601, 2907, 3627, 3757, 4199, 4743, 5301, 5491, 6851, 7657, 8959, 10013, 11271, 12597, 16473, 20553, 22971, 26877, 30039, 33813, 37791, 49419, 61659, 68913, 71383, 80631, 90117, 116467, 130169, 170221, 214149, 349401, 390507, 510663, 642447, 1048203, 1171521, 1531989, 2212873, 6638619, 19915857]

約数ペア:

[(1, 19915857), (3, 6638619), (9, 2212873), (13, 1531989), (17, 1171521), (19, 1048203), (31, 642447), (39, 510663), (51, 390507), (57, 349401), (93, 214149), (117, 170221), (153, 130169), (171, 116467), (221, 90117), (247, 80631), (279, 71383), (289, 68913), (323, 61659), (403, 49419), (527, 37791), (589, 33813), (663, 30039), (741, 26877), (867, 22971), (969, 20553), (1209, 16473), (1581, 12597), (1767, 11271), (1989, 10013), (2223, 8959), (2601, 7657), (2907, 6851), (3627, 5491), (3757, 5301), (4199, 4743)]