20990915

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{379}}^1$

素因数の和:467

約数の個数: 32

約数和(自身を含む): 29548800

約数和(自身を除く): 8557885

約数列:

[1, 5, 11, 19, 53, 55, 95, 209, 265, 379, 583, 1007, 1045, 1895, 2915, 4169, 5035, 7201, 11077, 20087, 20845, 36005, 55385, 79211, 100435, 220957, 381653, 396055, 1104785, 1908265, 4198183, 20990915]

約数ペア:

[(1, 20990915), (5, 4198183), (11, 1908265), (19, 1104785), (53, 396055), (55, 381653), (95, 220957), (209, 100435), (265, 79211), (379, 55385), (583, 36005), (1007, 20845), (1045, 20087), (1895, 11077), (2915, 7201), (4169, 5035)]