21207440

素因数分解:

$2^4\times 5^1\times {\mathrm{265093}}^1$

素因数の和:265106

約数の個数: 20

約数和(自身を含む): 49307484

約数和(自身を除く): 28100044

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265093, 530186, 1060372, 1325465, 2120744, 2650930, 4241488, 5301860, 10603720, 21207440]

約数ペア:

[(1, 21207440), (2, 10603720), (4, 5301860), (5, 4241488), (8, 2650930), (10, 2120744), (16, 1325465), (20, 1060372), (40, 530186), (80, 265093)]