21019990

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{2027}}^1$

素因数の和:2112

約数の個数: 32

約数和(自身を含む): 40738464

約数和(自身を除く): 19718474

約数列:

[1, 2, 5, 10, 17, 34, 61, 85, 122, 170, 305, 610, 1037, 2027, 2074, 4054, 5185, 10135, 10370, 20270, 34459, 68918, 123647, 172295, 247294, 344590, 618235, 1236470, 2101999, 4203998, 10509995, 21019990]

約数ペア:

[(1, 21019990), (2, 10509995), (5, 4203998), (10, 2101999), (17, 1236470), (34, 618235), (61, 344590), (85, 247294), (122, 172295), (170, 123647), (305, 68918), (610, 34459), (1037, 20270), (2027, 10370), (2074, 10135), (4054, 5185)]