20815780

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1\times {\mathrm{137}}^1$

素因数の和:324

約数の個数: 48

約数和(自身を含む): 45069696

約数和(自身を除く): 24253916

約数列:

[1, 2, 4, 5, 10, 20, 71, 107, 137, 142, 214, 274, 284, 355, 428, 535, 548, 685, 710, 1070, 1370, 1420, 2140, 2740, 7597, 9727, 14659, 15194, 19454, 29318, 30388, 37985, 38908, 48635, 58636, 73295, 75970, 97270, 146590, 151940, 194540, 293180, 1040789, 2081578, 4163156, 5203945, 10407890, 20815780]

約数ペア:

[(1, 20815780), (2, 10407890), (4, 5203945), (5, 4163156), (10, 2081578), (20, 1040789), (71, 293180), (107, 194540), (137, 151940), (142, 146590), (214, 97270), (274, 75970), (284, 73295), (355, 58636), (428, 48635), (535, 38908), (548, 37985), (685, 30388), (710, 29318), (1070, 19454), (1370, 15194), (1420, 14659), (2140, 9727), (2740, 7597)]