18911228

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{113}}^1\times {\mathrm{139}}^1$

素因数の和:306

約数の個数: 48

約数和(自身を含む): 39325440

約数和(自身を除く): 20414212

約数列:

[1, 2, 4, 7, 14, 28, 43, 86, 113, 139, 172, 226, 278, 301, 452, 556, 602, 791, 973, 1204, 1582, 1946, 3164, 3892, 4859, 5977, 9718, 11954, 15707, 19436, 23908, 31414, 34013, 41839, 62828, 68026, 83678, 109949, 136052, 167356, 219898, 439796, 675401, 1350802, 2701604, 4727807, 9455614, 18911228]

約数ペア:

[(1, 18911228), (2, 9455614), (4, 4727807), (7, 2701604), (14, 1350802), (28, 675401), (43, 439796), (86, 219898), (113, 167356), (139, 136052), (172, 109949), (226, 83678), (278, 68026), (301, 62828), (452, 41839), (556, 34013), (602, 31414), (791, 23908), (973, 19436), (1204, 15707), (1582, 11954), (1946, 9718), (3164, 5977), (3892, 4859)]