20915356

素因数分解:

$2^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:227

約数の個数: 72

約数和(自身を含む): 47401200

約数和(自身を除く): 26485844

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 44, 49, 77, 89, 98, 109, 154, 178, 196, 218, 308, 356, 436, 539, 623, 763, 979, 1078, 1199, 1246, 1526, 1958, 2156, 2398, 2492, 3052, 3916, 4361, 4796, 5341, 6853, 8393, 8722, 9701, 10682, 13706, 16786, 17444, 19402, 21364, 27412, 33572, 38804, 47971, 58751, 67907, 95942, 106711, 117502, 135814, 191884, 213422, 235004, 271628, 426844, 475349, 746977, 950698, 1493954, 1901396, 2987908, 5228839, 10457678, 20915356]

約数ペア:

[(1, 20915356), (2, 10457678), (4, 5228839), (7, 2987908), (11, 1901396), (14, 1493954), (22, 950698), (28, 746977), (44, 475349), (49, 426844), (77, 271628), (89, 235004), (98, 213422), (109, 191884), (154, 135814), (178, 117502), (196, 106711), (218, 95942), (308, 67907), (356, 58751), (436, 47971), (539, 38804), (623, 33572), (763, 27412), (979, 21364), (1078, 19402), (1199, 17444), (1246, 16786), (1526, 13706), (1958, 10682), (2156, 9701), (2398, 8722), (2492, 8393), (3052, 6853), (3916, 5341), (4361, 4796)]