21991905

素因数分解:

$3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4177}}^1$

素因数の和:4207

約数の個数: 40

約数和(自身を含む): 42465192

約数和(自身を除く): 20473287

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 81, 117, 135, 195, 351, 405, 585, 1053, 1755, 4177, 5265, 12531, 20885, 37593, 54301, 62655, 112779, 162903, 187965, 271505, 338337, 488709, 563895, 814515, 1466127, 1691685, 2443545, 4398381, 7330635, 21991905]

約数ペア:

[(1, 21991905), (3, 7330635), (5, 4398381), (9, 2443545), (13, 1691685), (15, 1466127), (27, 814515), (39, 563895), (45, 488709), (65, 338337), (81, 271505), (117, 187965), (135, 162903), (195, 112779), (351, 62655), (405, 54301), (585, 37593), (1053, 20885), (1755, 12531), (4177, 5265)]