21070480

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15493}}^1$

素因数の和:15523

約数の個数: 40

約数和(自身を含む): 51873912

約数和(自身を除く): 30803432

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15493, 30986, 61972, 77465, 123944, 154930, 247888, 263381, 309860, 526762, 619720, 1053524, 1239440, 1316905, 2107048, 2633810, 4214096, 5267620, 10535240, 21070480]

約数ペア:

[(1, 21070480), (2, 10535240), (4, 5267620), (5, 4214096), (8, 2633810), (10, 2107048), (16, 1316905), (17, 1239440), (20, 1053524), (34, 619720), (40, 526762), (68, 309860), (80, 263381), (85, 247888), (136, 154930), (170, 123944), (272, 77465), (340, 61972), (680, 30986), (1360, 15493)]