21729808

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{79889}}^1$

素因数の和:79914

約数の個数: 20

約数和(自身を含む): 44578620

約数和(自身を除く): 22848812

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 79889, 159778, 319556, 639112, 1278224, 1358113, 2716226, 5432452, 10864904, 21729808]

約数ペア:

[(1, 21729808), (2, 10864904), (4, 5432452), (8, 2716226), (16, 1358113), (17, 1278224), (34, 639112), (68, 319556), (136, 159778), (272, 79889)]