81987780

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{353}}^1$

素因数の和:458

約数の個数: 144

約数和(自身を含む): 271192320

約数和(自身を除く): 189204540

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 79, 84, 98, 105, 140, 147, 158, 196, 210, 237, 245, 294, 316, 353, 395, 420, 474, 490, 553, 588, 706, 735, 790, 948, 980, 1059, 1106, 1185, 1412, 1470, 1580, 1659, 1765, 2118, 2212, 2370, 2471, 2765, 2940, 3318, 3530, 3871, 4236, 4740, 4942, 5295, 5530, 6636, 7060, 7413, 7742, 8295, 9884, 10590, 11060, 11613, 12355, 14826, 15484, 16590, 17297, 19355, 21180, 23226, 24710, 27887, 29652, 33180, 34594, 37065, 38710, 46452, 49420, 51891, 55774, 58065, 69188, 74130, 77420, 83661, 86485, 103782, 111548, 116130, 139435, 148260, 167322, 172970, 195209, 207564, 232260, 259455, 278870, 334644, 345940, 390418, 418305, 518910, 557740, 585627, 780836, 836610, 976045, 1037820, 1171254, 1366463, 1673220, 1952090, 2342508, 2732926, 2928135, 3904180, 4099389, 5465852, 5856270, 6832315, 8198778, 11712540, 13664630, 16397556, 20496945, 27329260, 40993890, 81987780]

約数ペア:

[(1, 81987780), (2, 40993890), (3, 27329260), (4, 20496945), (5, 16397556), (6, 13664630), (7, 11712540), (10, 8198778), (12, 6832315), (14, 5856270), (15, 5465852), (20, 4099389), (21, 3904180), (28, 2928135), (30, 2732926), (35, 2342508), (42, 1952090), (49, 1673220), (60, 1366463), (70, 1171254), (79, 1037820), (84, 976045), (98, 836610), (105, 780836), (140, 585627), (147, 557740), (158, 518910), (196, 418305), (210, 390418), (237, 345940), (245, 334644), (294, 278870), (316, 259455), (353, 232260), (395, 207564), (420, 195209), (474, 172970), (490, 167322), (553, 148260), (588, 139435), (706, 116130), (735, 111548), (790, 103782), (948, 86485), (980, 83661), (1059, 77420), (1106, 74130), (1185, 69188), (1412, 58065), (1470, 55774), (1580, 51891), (1659, 49420), (1765, 46452), (2118, 38710), (2212, 37065), (2370, 34594), (2471, 33180), (2765, 29652), (2940, 27887), (3318, 24710), (3530, 23226), (3871, 21180), (4236, 19355), (4740, 17297), (4942, 16590), (5295, 15484), (5530, 14826), (6636, 12355), (7060, 11613), (7413, 11060), (7742, 10590), (8295, 9884)]