21010808

素因数分解:

$2^3\times 7^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1$

素因数の和:90

約数の個数: 128

約数和(自身を含む): 53760000

約数和(自身を除く): 32749192

約数列:

[1, 2, 4, 7, 8, 13, 14, 19, 26, 28, 31, 38, 49, 52, 56, 62, 76, 91, 98, 104, 124, 133, 152, 182, 196, 217, 247, 248, 266, 343, 364, 392, 403, 434, 494, 532, 589, 637, 686, 728, 806, 868, 931, 988, 1064, 1178, 1274, 1372, 1519, 1612, 1729, 1736, 1862, 1976, 2356, 2548, 2744, 2821, 3038, 3224, 3458, 3724, 4123, 4459, 4712, 5096, 5642, 6076, 6517, 6916, 7448, 7657, 8246, 8918, 10633, 11284, 12103, 12152, 13034, 13832, 15314, 16492, 17836, 19747, 21266, 22568, 24206, 26068, 28861, 30628, 32984, 35672, 39494, 42532, 48412, 52136, 53599, 57722, 61256, 78988, 84721, 85064, 96824, 107198, 115444, 138229, 157976, 169442, 202027, 214396, 230888, 276458, 338884, 375193, 404054, 428792, 552916, 677768, 750386, 808108, 1105832, 1500772, 1616216, 2626351, 3001544, 5252702, 10505404, 21010808]

約数ペア:

[(1, 21010808), (2, 10505404), (4, 5252702), (7, 3001544), (8, 2626351), (13, 1616216), (14, 1500772), (19, 1105832), (26, 808108), (28, 750386), (31, 677768), (38, 552916), (49, 428792), (52, 404054), (56, 375193), (62, 338884), (76, 276458), (91, 230888), (98, 214396), (104, 202027), (124, 169442), (133, 157976), (152, 138229), (182, 115444), (196, 107198), (217, 96824), (247, 85064), (248, 84721), (266, 78988), (343, 61256), (364, 57722), (392, 53599), (403, 52136), (434, 48412), (494, 42532), (532, 39494), (589, 35672), (637, 32984), (686, 30628), (728, 28861), (806, 26068), (868, 24206), (931, 22568), (988, 21266), (1064, 19747), (1178, 17836), (1274, 16492), (1372, 15314), (1519, 13832), (1612, 13034), (1729, 12152), (1736, 12103), (1862, 11284), (1976, 10633), (2356, 8918), (2548, 8246), (2744, 7657), (2821, 7448), (3038, 6916), (3224, 6517), (3458, 6076), (3724, 5642), (4123, 5096), (4459, 4712)]