21001232

素因数分解:

$2^4\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:244

約数の個数: 80

約数和(自身を含む): 49996800

約数和(自身を除く): 28995568

約数列:

[1, 2, 4, 7, 8, 14, 16, 19, 28, 38, 56, 71, 76, 112, 133, 139, 142, 152, 266, 278, 284, 304, 497, 532, 556, 568, 973, 994, 1064, 1112, 1136, 1349, 1946, 1988, 2128, 2224, 2641, 2698, 3892, 3976, 5282, 5396, 7784, 7952, 9443, 9869, 10564, 10792, 15568, 18487, 18886, 19738, 21128, 21584, 36974, 37772, 39476, 42256, 69083, 73948, 75544, 78952, 138166, 147896, 151088, 157904, 187511, 276332, 295792, 375022, 552664, 750044, 1105328, 1312577, 1500088, 2625154, 3000176, 5250308, 10500616, 21001232]

約数ペア:

[(1, 21001232), (2, 10500616), (4, 5250308), (7, 3000176), (8, 2625154), (14, 1500088), (16, 1312577), (19, 1105328), (28, 750044), (38, 552664), (56, 375022), (71, 295792), (76, 276332), (112, 187511), (133, 157904), (139, 151088), (142, 147896), (152, 138166), (266, 78952), (278, 75544), (284, 73948), (304, 69083), (497, 42256), (532, 39476), (556, 37772), (568, 36974), (973, 21584), (994, 21128), (1064, 19738), (1112, 18886), (1136, 18487), (1349, 15568), (1946, 10792), (1988, 10564), (2128, 9869), (2224, 9443), (2641, 7952), (2698, 7784), (3892, 5396), (3976, 5282)]