21328240

素因数分解:

$2^4\times 5^1\times {\mathrm{266603}}^1$

素因数の和:266616

約数の個数: 20

約数和(自身を含む): 49588344

約数和(自身を除く): 28260104

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266603, 533206, 1066412, 1333015, 2132824, 2666030, 4265648, 5332060, 10664120, 21328240]

約数ペア:

[(1, 21328240), (2, 10664120), (4, 5332060), (5, 4265648), (8, 2666030), (10, 2132824), (16, 1333015), (20, 1066412), (40, 533206), (80, 266603)]