80904880

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20639}}^1$

素因数の和:20666

約数の個数: 60

約数和(自身を含む): 218825280

約数和(自身を除く): 137920400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20639, 41278, 82556, 103195, 144473, 165112, 206390, 288946, 330224, 412780, 577892, 722365, 825560, 1011311, 1155784, 1444730, 1651120, 2022622, 2311568, 2889460, 4045244, 5056555, 5778920, 8090488, 10113110, 11557840, 16180976, 20226220, 40452440, 80904880]

約数ペア:

[(1, 80904880), (2, 40452440), (4, 20226220), (5, 16180976), (7, 11557840), (8, 10113110), (10, 8090488), (14, 5778920), (16, 5056555), (20, 4045244), (28, 2889460), (35, 2311568), (40, 2022622), (49, 1651120), (56, 1444730), (70, 1155784), (80, 1011311), (98, 825560), (112, 722365), (140, 577892), (196, 412780), (245, 330224), (280, 288946), (392, 206390), (490, 165112), (560, 144473), (784, 103195), (980, 82556), (1960, 41278), (3920, 20639)]