81991.0000000

素因数分解:

$2^4\times 7^1\times {\mathrm{17}}^1\times {\mathrm{1747}}^1$

素因数の和:1779

約数の個数: 40

約数和(自身を含む): 7803072

約数和(自身を除く): 4476784

約数列:

[1, 2, 4, 7, 8, 14, 16, 17, 28, 34, 56, 68, 112, 119, 136, 238, 272, 476, 952, 1747, 1904, 3494, 6988, 12229, 13976, 24458, 27952, 29699, 48916, 59398, 97832, 118796, 195664, 207893, 237592, 415786, 475184, 831572, 1663144, 3326288]

約数ペア:

[(1, 3326288), (2, 1663144), (4, 831572), (7, 475184), (8, 415786), (14, 237592), (16, 207893), (17, 195664), (28, 118796), (34, 97832), (56, 59398), (68, 48916), (112, 29699), (119, 27952), (136, 24458), (238, 13976), (272, 12229), (476, 6988), (952, 3494), (1747, 1904)]