21091615

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1$

素因数の和:207

約数の個数: 32

約数和(自身を含む): 27993600

約数和(自身を除く): 6901985

約数列:

[1, 5, 19, 53, 59, 71, 95, 265, 295, 355, 1007, 1121, 1349, 3127, 3763, 4189, 5035, 5605, 6745, 15635, 18815, 20945, 59413, 71497, 79591, 222017, 297065, 357485, 397955, 1110085, 4218323, 21091615]

約数ペア:

[(1, 21091615), (5, 4218323), (19, 1110085), (53, 397955), (59, 357485), (71, 297065), (95, 222017), (265, 79591), (295, 71497), (355, 59413), (1007, 20945), (1121, 18815), (1349, 15635), (3127, 6745), (3763, 5605), (4189, 5035)]