81871988

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{307}}^1$

素因数の和:381

約数の個数: 72

約数和(自身を含む): 172048800

約数和(自身を除く): 90176812

約数列:

[1, 2, 4, 11, 19, 22, 29, 38, 44, 58, 76, 116, 121, 209, 242, 307, 319, 418, 484, 551, 614, 638, 836, 1102, 1228, 1276, 2204, 2299, 3377, 3509, 4598, 5833, 6061, 6754, 7018, 8903, 9196, 11666, 12122, 13508, 14036, 17806, 23332, 24244, 35612, 37147, 64163, 66671, 74294, 97933, 128326, 133342, 148588, 169157, 195866, 256652, 266684, 338314, 391732, 676628, 705793, 1077263, 1411586, 1860727, 2154526, 2823172, 3721454, 4309052, 7442908, 20467997, 40935994, 81871988]

約数ペア:

[(1, 81871988), (2, 40935994), (4, 20467997), (11, 7442908), (19, 4309052), (22, 3721454), (29, 2823172), (38, 2154526), (44, 1860727), (58, 1411586), (76, 1077263), (116, 705793), (121, 676628), (209, 391732), (242, 338314), (307, 266684), (319, 256652), (418, 195866), (484, 169157), (551, 148588), (614, 133342), (638, 128326), (836, 97933), (1102, 74294), (1228, 66671), (1276, 64163), (2204, 37147), (2299, 35612), (3377, 24244), (3509, 23332), (4598, 17806), (5833, 14036), (6061, 13508), (6754, 12122), (7018, 11666), (8903, 9196)]