81992020

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{1993}}^1$

素因数の和:2041

約数の個数: 72

約数和(自身を含む): 200492712

約数和(自身を除く): 118500692

約数列:

[1, 2, 4, 5, 10, 11, 17, 20, 22, 34, 44, 55, 68, 85, 110, 121, 170, 187, 220, 242, 340, 374, 484, 605, 748, 935, 1210, 1870, 1993, 2057, 2420, 3740, 3986, 4114, 7972, 8228, 9965, 10285, 19930, 20570, 21923, 33881, 39860, 41140, 43846, 67762, 87692, 109615, 135524, 169405, 219230, 241153, 338810, 372691, 438460, 482306, 677620, 745382, 964612, 1205765, 1490764, 1863455, 2411530, 3726910, 4099601, 4823060, 7453820, 8199202, 16398404, 20498005, 40996010, 81992020]

約数ペア:

[(1, 81992020), (2, 40996010), (4, 20498005), (5, 16398404), (10, 8199202), (11, 7453820), (17, 4823060), (20, 4099601), (22, 3726910), (34, 2411530), (44, 1863455), (55, 1490764), (68, 1205765), (85, 964612), (110, 745382), (121, 677620), (170, 482306), (187, 438460), (220, 372691), (242, 338810), (340, 241153), (374, 219230), (484, 169405), (605, 135524), (748, 109615), (935, 87692), (1210, 67762), (1870, 43846), (1993, 41140), (2057, 39860), (2420, 33881), (3740, 21923), (3986, 20570), (4114, 19930), (7972, 10285), (8228, 9965)]