640545983

素因数分解:

$7^4\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{307}}^1$

素因数の和:425

約数の個数: 40

約数和(自身を含む): 828199680

約数和(自身を除く): 187653697

約数列:

[1, 7, 11, 49, 77, 79, 307, 343, 539, 553, 869, 2149, 2401, 3377, 3773, 3871, 6083, 15043, 23639, 24253, 26411, 27097, 42581, 105301, 165473, 169771, 189679, 266783, 298067, 737107, 1158311, 1188397, 1867481, 2086469, 8108177, 8318779, 13072367, 58231453, 91506569, 640545983]

約数ペア:

[(1, 640545983), (7, 91506569), (11, 58231453), (49, 13072367), (77, 8318779), (79, 8108177), (307, 2086469), (343, 1867481), (539, 1188397), (553, 1158311), (869, 737107), (2149, 298067), (2401, 266783), (3377, 189679), (3773, 169771), (3871, 165473), (6083, 105301), (15043, 42581), (23639, 27097), (24253, 26411)]