20991100

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{241}}^1$

素因数の和:335

約数の個数: 72

約数和(自身を含む): 49993328

約数和(自身を除く): 29002228

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 67, 100, 130, 134, 241, 260, 268, 325, 335, 482, 650, 670, 871, 964, 1205, 1300, 1340, 1675, 1742, 2410, 3133, 3350, 3484, 4355, 4820, 6025, 6266, 6700, 8710, 12050, 12532, 15665, 16147, 17420, 21775, 24100, 31330, 32294, 43550, 62660, 64588, 78325, 80735, 87100, 156650, 161470, 209911, 313300, 322940, 403675, 419822, 807350, 839644, 1049555, 1614700, 2099110, 4198220, 5247775, 10495550, 20991100]

約数ペア:

[(1, 20991100), (2, 10495550), (4, 5247775), (5, 4198220), (10, 2099110), (13, 1614700), (20, 1049555), (25, 839644), (26, 807350), (50, 419822), (52, 403675), (65, 322940), (67, 313300), (100, 209911), (130, 161470), (134, 156650), (241, 87100), (260, 80735), (268, 78325), (325, 64588), (335, 62660), (482, 43550), (650, 32294), (670, 31330), (871, 24100), (964, 21775), (1205, 17420), (1300, 16147), (1340, 15665), (1675, 12532), (1742, 12050), (2410, 8710), (3133, 6700), (3350, 6266), (3484, 6025), (4355, 4820)]