21340040

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{653}}^1$

素因数の和:726

約数の個数: 64

約数和(自身を含む): 51796800

約数和(自身を除く): 30456760

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 43, 76, 86, 95, 152, 172, 190, 215, 344, 380, 430, 653, 760, 817, 860, 1306, 1634, 1720, 2612, 3265, 3268, 4085, 5224, 6530, 6536, 8170, 12407, 13060, 16340, 24814, 26120, 28079, 32680, 49628, 56158, 62035, 99256, 112316, 124070, 140395, 224632, 248140, 280790, 496280, 533501, 561580, 1067002, 1123160, 2134004, 2667505, 4268008, 5335010, 10670020, 21340040]

約数ペア:

[(1, 21340040), (2, 10670020), (4, 5335010), (5, 4268008), (8, 2667505), (10, 2134004), (19, 1123160), (20, 1067002), (38, 561580), (40, 533501), (43, 496280), (76, 280790), (86, 248140), (95, 224632), (152, 140395), (172, 124070), (190, 112316), (215, 99256), (344, 62035), (380, 56158), (430, 49628), (653, 32680), (760, 28079), (817, 26120), (860, 24814), (1306, 16340), (1634, 13060), (1720, 12407), (2612, 8170), (3265, 6536), (3268, 6530), (4085, 5224)]