20995988

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{269}}^1$

素因数の和:384

約数の個数: 48

約数和(自身を含む): 42336000

約数和(自身を除く): 21340012

約数列:

[1, 2, 4, 13, 19, 26, 38, 52, 76, 79, 158, 247, 269, 316, 494, 538, 988, 1027, 1076, 1501, 2054, 3002, 3497, 4108, 5111, 6004, 6994, 10222, 13988, 19513, 20444, 21251, 39026, 42502, 66443, 78052, 85004, 132886, 265772, 276263, 403769, 552526, 807538, 1105052, 1615076, 5248997, 10497994, 20995988]

約数ペア:

[(1, 20995988), (2, 10497994), (4, 5248997), (13, 1615076), (19, 1105052), (26, 807538), (38, 552526), (52, 403769), (76, 276263), (79, 265772), (158, 132886), (247, 85004), (269, 78052), (316, 66443), (494, 42502), (538, 39026), (988, 21251), (1027, 20444), (1076, 19513), (1501, 13988), (2054, 10222), (3002, 6994), (3497, 6004), (4108, 5111)]