20990420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{73}}^1\times {\mathrm{1307}}^1$

素因数の和:1400

約数の個数: 48

約数和(自身を含む): 48783168

約数和(自身を除く): 27792748

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 73, 110, 146, 220, 292, 365, 730, 803, 1307, 1460, 1606, 2614, 3212, 4015, 5228, 6535, 8030, 13070, 14377, 16060, 26140, 28754, 57508, 71885, 95411, 143770, 190822, 287540, 381644, 477055, 954110, 1049521, 1908220, 2099042, 4198084, 5247605, 10495210, 20990420]

約数ペア:

[(1, 20990420), (2, 10495210), (4, 5247605), (5, 4198084), (10, 2099042), (11, 1908220), (20, 1049521), (22, 954110), (44, 477055), (55, 381644), (73, 287540), (110, 190822), (146, 143770), (220, 95411), (292, 71885), (365, 57508), (730, 28754), (803, 26140), (1307, 16060), (1460, 14377), (1606, 13070), (2614, 8030), (3212, 6535), (4015, 5228)]