21971325

素因数分解:

$3^1\times 5^2\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{271}}^1$

素因数の和:354

約数の個数: 48

約数和(自身を含む): 38854656

約数和(自身を除く): 16883331

約数列:

[1, 3, 5, 15, 23, 25, 47, 69, 75, 115, 141, 235, 271, 345, 575, 705, 813, 1081, 1175, 1355, 1725, 3243, 3525, 4065, 5405, 6233, 6775, 12737, 16215, 18699, 20325, 27025, 31165, 38211, 63685, 81075, 93495, 155825, 191055, 292951, 318425, 467475, 878853, 955275, 1464755, 4394265, 7323775, 21971325]

約数ペア:

[(1, 21971325), (3, 7323775), (5, 4394265), (15, 1464755), (23, 955275), (25, 878853), (47, 467475), (69, 318425), (75, 292951), (115, 191055), (141, 155825), (235, 93495), (271, 81075), (345, 63685), (575, 38211), (705, 31165), (813, 27025), (1081, 20325), (1175, 18699), (1355, 16215), (1725, 12737), (3243, 6775), (3525, 6233), (4065, 5405)]