851980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{1039}}^1$

素因数の和:1089

約数の個数: 24

約数和(自身を含む): 1834560

約数和(自身を除く): 982580

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 1039, 2078, 4156, 5195, 10390, 20780, 42599, 85198, 170396, 212995, 425990, 851980]

約数ペア:

[(1, 851980), (2, 425990), (4, 212995), (5, 170396), (10, 85198), (20, 42599), (41, 20780), (82, 10390), (164, 5195), (205, 4156), (410, 2078), (820, 1039)]