21279328

素因数分解:

$2^5\times 7^2\times {\mathrm{41}}^1\times {\mathrm{331}}^1$

素因数の和:396

約数の個数: 72

約数和(自身を含む): 50072904

約数和(自身を除く): 28793576

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 32, 41, 49, 56, 82, 98, 112, 164, 196, 224, 287, 328, 331, 392, 574, 656, 662, 784, 1148, 1312, 1324, 1568, 2009, 2296, 2317, 2648, 4018, 4592, 4634, 5296, 8036, 9184, 9268, 10592, 13571, 16072, 16219, 18536, 27142, 32144, 32438, 37072, 54284, 64288, 64876, 74144, 94997, 108568, 129752, 189994, 217136, 259504, 379988, 434272, 519008, 664979, 759976, 1329958, 1519952, 2659916, 3039904, 5319832, 10639664, 21279328]

約数ペア:

[(1, 21279328), (2, 10639664), (4, 5319832), (7, 3039904), (8, 2659916), (14, 1519952), (16, 1329958), (28, 759976), (32, 664979), (41, 519008), (49, 434272), (56, 379988), (82, 259504), (98, 217136), (112, 189994), (164, 129752), (196, 108568), (224, 94997), (287, 74144), (328, 64876), (331, 64288), (392, 54284), (574, 37072), (656, 32438), (662, 32144), (784, 27142), (1148, 18536), (1312, 16219), (1324, 16072), (1568, 13571), (2009, 10592), (2296, 9268), (2317, 9184), (2648, 8036), (4018, 5296), (4592, 4634)]