21240784

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{107}}^1\times {\mathrm{653}}^1$

素因数の和:787

約数の個数: 40

約数和(自身を含む): 43791840

約数和(自身を除く): 22551056

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 107, 152, 214, 304, 428, 653, 856, 1306, 1712, 2033, 2612, 4066, 5224, 8132, 10448, 12407, 16264, 24814, 32528, 49628, 69871, 99256, 139742, 198512, 279484, 558968, 1117936, 1327549, 2655098, 5310196, 10620392, 21240784]

約数ペア:

[(1, 21240784), (2, 10620392), (4, 5310196), (8, 2655098), (16, 1327549), (19, 1117936), (38, 558968), (76, 279484), (107, 198512), (152, 139742), (214, 99256), (304, 69871), (428, 49628), (653, 32528), (856, 24814), (1306, 16264), (1712, 12407), (2033, 10448), (2612, 8132), (4066, 5224)]