21211540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{1193}}^1$

素因数の和:1336

約数の個数: 48

約数和(自身を含む): 51351552

約数和(自身を除く): 30140012

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1193, 1270, 1778, 2386, 2540, 3556, 4445, 4772, 5965, 8351, 8890, 11930, 16702, 17780, 23860, 33404, 41755, 83510, 151511, 167020, 303022, 606044, 757555, 1060577, 1515110, 2121154, 3030220, 4242308, 5302885, 10605770, 21211540]

約数ペア:

[(1, 21211540), (2, 10605770), (4, 5302885), (5, 4242308), (7, 3030220), (10, 2121154), (14, 1515110), (20, 1060577), (28, 757555), (35, 606044), (70, 303022), (127, 167020), (140, 151511), (254, 83510), (508, 41755), (635, 33404), (889, 23860), (1193, 17780), (1270, 16702), (1778, 11930), (2386, 8890), (2540, 8351), (3556, 5965), (4445, 4772)]