19991388

素因数分解:

$2^2\times 3^1\times {\mathrm{17}}^1\times {\mathrm{43}}^2\times {\mathrm{53}}^1$

素因数の和:163

約数の個数: 72

約数和(自身を含む): 51519888

約数和(自身を除く): 31528500

約数列:

[1, 2, 3, 4, 6, 12, 17, 34, 43, 51, 53, 68, 86, 102, 106, 129, 159, 172, 204, 212, 258, 318, 516, 636, 731, 901, 1462, 1802, 1849, 2193, 2279, 2703, 2924, 3604, 3698, 4386, 4558, 5406, 5547, 6837, 7396, 8772, 9116, 10812, 11094, 13674, 22188, 27348, 31433, 38743, 62866, 77486, 94299, 97997, 116229, 125732, 154972, 188598, 195994, 232458, 293991, 377196, 391988, 464916, 587982, 1175964, 1665949, 3331898, 4997847, 6663796, 9995694, 19991388]

約数ペア:

[(1, 19991388), (2, 9995694), (3, 6663796), (4, 4997847), (6, 3331898), (12, 1665949), (17, 1175964), (34, 587982), (43, 464916), (51, 391988), (53, 377196), (68, 293991), (86, 232458), (102, 195994), (106, 188598), (129, 154972), (159, 125732), (172, 116229), (204, 97997), (212, 94299), (258, 77486), (318, 62866), (516, 38743), (636, 31433), (731, 27348), (901, 22188), (1462, 13674), (1802, 11094), (1849, 10812), (2193, 9116), (2279, 8772), (2703, 7396), (2924, 6837), (3604, 5547), (3698, 5406), (4386, 4558)]