21231440

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6473}}^1$

素因数の和:6527

約数の個数: 40

約数和(自身を含む): 50574888

約数和(自身を除く): 29343448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6473, 12946, 25892, 32365, 51784, 64730, 103568, 129460, 258920, 265393, 517840, 530786, 1061572, 1326965, 2123144, 2653930, 4246288, 5307860, 10615720, 21231440]

約数ペア:

[(1, 21231440), (2, 10615720), (4, 5307860), (5, 4246288), (8, 2653930), (10, 2123144), (16, 1326965), (20, 1061572), (40, 530786), (41, 517840), (80, 265393), (82, 258920), (164, 129460), (205, 103568), (328, 64730), (410, 51784), (656, 32365), (820, 25892), (1640, 12946), (3280, 6473)]