21504447

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:277

約数の個数: 40

約数和(自身を含む): 34412400

約数和(自身を除く): 12907953

約数列:

[1, 3, 9, 19, 27, 57, 81, 89, 157, 171, 267, 471, 513, 801, 1413, 1539, 1691, 2403, 2983, 4239, 5073, 7209, 8949, 12717, 13973, 15219, 26847, 41919, 45657, 80541, 125757, 136971, 241623, 265487, 377271, 796461, 1131813, 2389383, 7168149, 21504447]

約数ペア:

[(1, 21504447), (3, 7168149), (9, 2389383), (19, 1131813), (27, 796461), (57, 377271), (81, 265487), (89, 241623), (157, 136971), (171, 125757), (267, 80541), (471, 45657), (513, 41919), (801, 26847), (1413, 15219), (1539, 13973), (1691, 12717), (2403, 8949), (2983, 7209), (4239, 5073)]