21131120

素因数分解:

$2^4\times 5^1\times {\mathrm{264139}}^1$

素因数の和:264152

約数の個数: 20

約数和(自身を含む): 49130040

約数和(自身を除く): 27998920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264139, 528278, 1056556, 1320695, 2113112, 2641390, 4226224, 5282780, 10565560, 21131120]

約数ペア:

[(1, 21131120), (2, 10565560), (4, 5282780), (5, 4226224), (8, 2641390), (10, 2113112), (16, 1320695), (20, 1056556), (40, 528278), (80, 264139)]