21487275

素因数分解:

$3^8\times 5^2\times {\mathrm{131}}^1$

素因数の和:165

約数の個数: 54

約数和(自身を含む): 40269372

約数和(自身を除く): 18782097

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 131, 135, 225, 243, 393, 405, 655, 675, 729, 1179, 1215, 1965, 2025, 2187, 3275, 3537, 3645, 5895, 6075, 6561, 9825, 10611, 10935, 17685, 18225, 29475, 31833, 32805, 53055, 54675, 88425, 95499, 159165, 164025, 265275, 286497, 477495, 795825, 859491, 1432485, 2387475, 4297455, 7162425, 21487275]

約数ペア:

[(1, 21487275), (3, 7162425), (5, 4297455), (9, 2387475), (15, 1432485), (25, 859491), (27, 795825), (45, 477495), (75, 286497), (81, 265275), (131, 164025), (135, 159165), (225, 95499), (243, 88425), (393, 54675), (405, 53055), (655, 32805), (675, 31833), (729, 29475), (1179, 18225), (1215, 17685), (1965, 10935), (2025, 10611), (2187, 9825), (3275, 6561), (3537, 6075), (3645, 5895)]