20900912

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{197}}^1\times {\mathrm{349}}^1$

素因数の和:573

約数の個数: 40

約数和(自身を含む): 42966000

約数和(自身を除く): 22065088

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 197, 304, 349, 394, 698, 788, 1396, 1576, 2792, 3152, 3743, 5584, 6631, 7486, 13262, 14972, 26524, 29944, 53048, 59888, 68753, 106096, 137506, 275012, 550024, 1100048, 1306307, 2612614, 5225228, 10450456, 20900912]

約数ペア:

[(1, 20900912), (2, 10450456), (4, 5225228), (8, 2612614), (16, 1306307), (19, 1100048), (38, 550024), (76, 275012), (152, 137506), (197, 106096), (304, 68753), (349, 59888), (394, 53048), (698, 29944), (788, 26524), (1396, 14972), (1576, 13262), (2792, 7486), (3152, 6631), (3743, 5584)]