19801328

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{1693}}^1$

素因数の和:1761

約数の個数: 40

約数和(自身を含む): 41591088

約数和(自身を除く): 21789760

約数列:

[1, 2, 4, 8, 16, 17, 34, 43, 68, 86, 136, 172, 272, 344, 688, 731, 1462, 1693, 2924, 3386, 5848, 6772, 11696, 13544, 27088, 28781, 57562, 72799, 115124, 145598, 230248, 291196, 460496, 582392, 1164784, 1237583, 2475166, 4950332, 9900664, 19801328]

約数ペア:

[(1, 19801328), (2, 9900664), (4, 4950332), (8, 2475166), (16, 1237583), (17, 1164784), (34, 582392), (43, 460496), (68, 291196), (86, 230248), (136, 145598), (172, 115124), (272, 72799), (344, 57562), (688, 28781), (731, 27088), (1462, 13544), (1693, 11696), (2924, 6772), (3386, 5848)]