21123920

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3719}}^1$

素因数の和:3803

約数の個数: 40

約数和(自身を含む): 49818240

約数和(自身を除く): 28694320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3719, 5680, 7438, 14876, 18595, 29752, 37190, 59504, 74380, 148760, 264049, 297520, 528098, 1056196, 1320245, 2112392, 2640490, 4224784, 5280980, 10561960, 21123920]

約数ペア:

[(1, 21123920), (2, 10561960), (4, 5280980), (5, 4224784), (8, 2640490), (10, 2112392), (16, 1320245), (20, 1056196), (40, 528098), (71, 297520), (80, 264049), (142, 148760), (284, 74380), (355, 59504), (568, 37190), (710, 29752), (1136, 18595), (1420, 14876), (2840, 7438), (3719, 5680)]