21287440

素因数分解:

$2^4\times 5^1\times {\mathrm{266093}}^1$

素因数の和:266106

約数の個数: 20

約数和(自身を含む): 49493484

約数和(自身を除く): 28206044

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266093, 532186, 1064372, 1330465, 2128744, 2660930, 4257488, 5321860, 10643720, 21287440]

約数ペア:

[(1, 21287440), (2, 10643720), (4, 5321860), (5, 4257488), (8, 2660930), (10, 2128744), (16, 1330465), (20, 1064372), (40, 532186), (80, 266093)]