21161740

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{131}}^1\times {\mathrm{197}}^1$

素因数の和:378

約数の個数: 48

約数和(自身を含む): 46103904

約数和(自身を除く): 24942164

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 131, 164, 197, 205, 262, 394, 410, 524, 655, 788, 820, 985, 1310, 1970, 2620, 3940, 5371, 8077, 10742, 16154, 21484, 25807, 26855, 32308, 40385, 51614, 53710, 80770, 103228, 107420, 129035, 161540, 258070, 516140, 1058087, 2116174, 4232348, 5290435, 10580870, 21161740]

約数ペア:

[(1, 21161740), (2, 10580870), (4, 5290435), (5, 4232348), (10, 2116174), (20, 1058087), (41, 516140), (82, 258070), (131, 161540), (164, 129035), (197, 107420), (205, 103228), (262, 80770), (394, 53710), (410, 51614), (524, 40385), (655, 32308), (788, 26855), (820, 25807), (985, 21484), (1310, 16154), (1970, 10742), (2620, 8077), (3940, 5371)]