21665637

素因数分解:

$3^5\times 7^1\times {\mathrm{47}}^1\times {\mathrm{271}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 38019072

約数和(自身を除く): 16353435

約数列:

[1, 3, 7, 9, 21, 27, 47, 63, 81, 141, 189, 243, 271, 329, 423, 567, 813, 987, 1269, 1701, 1897, 2439, 2961, 3807, 5691, 7317, 8883, 11421, 12737, 17073, 21951, 26649, 38211, 51219, 65853, 79947, 89159, 114633, 153657, 267477, 343899, 460971, 802431, 1031697, 2407293, 3095091, 7221879, 21665637]

約数ペア:

[(1, 21665637), (3, 7221879), (7, 3095091), (9, 2407293), (21, 1031697), (27, 802431), (47, 460971), (63, 343899), (81, 267477), (141, 153657), (189, 114633), (243, 89159), (271, 79947), (329, 65853), (423, 51219), (567, 38211), (813, 26649), (987, 21951), (1269, 17073), (1701, 12737), (1897, 11421), (2439, 8883), (2961, 7317), (3807, 5691)]