21256120

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31259}}^1$

素因数の和:31287

約数の個数: 32

約数和(自身を含む): 50641200

約数和(自身を除く): 29385080

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31259, 62518, 125036, 156295, 250072, 312590, 531403, 625180, 1062806, 1250360, 2125612, 2657015, 4251224, 5314030, 10628060, 21256120]

約数ペア:

[(1, 21256120), (2, 10628060), (4, 5314030), (5, 4251224), (8, 2657015), (10, 2125612), (17, 1250360), (20, 1062806), (34, 625180), (40, 531403), (68, 312590), (85, 250072), (136, 156295), (170, 125036), (340, 62518), (680, 31259)]