18991312

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{69821}}^1$

素因数の和:69846

約数の個数: 20

約数和(自身を含む): 38960676

約数和(自身を除く): 19969364

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 69821, 139642, 279284, 558568, 1117136, 1186957, 2373914, 4747828, 9495656, 18991312]

約数ペア:

[(1, 18991312), (2, 9495656), (4, 4747828), (8, 2373914), (16, 1186957), (17, 1117136), (34, 558568), (68, 279284), (136, 139642), (272, 69821)]