21102320

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{127}}^1$

素因数の和:238

約数の個数: 80

約数和(自身を含む): 51806208

約数和(自身を除く): 30703888

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 67, 80, 124, 127, 134, 155, 248, 254, 268, 310, 335, 496, 508, 536, 620, 635, 670, 1016, 1072, 1240, 1270, 1340, 2032, 2077, 2480, 2540, 2680, 3937, 4154, 5080, 5360, 7874, 8308, 8509, 10160, 10385, 15748, 16616, 17018, 19685, 20770, 31496, 33232, 34036, 39370, 41540, 42545, 62992, 68072, 78740, 83080, 85090, 136144, 157480, 166160, 170180, 263779, 314960, 340360, 527558, 680720, 1055116, 1318895, 2110232, 2637790, 4220464, 5275580, 10551160, 21102320]

約数ペア:

[(1, 21102320), (2, 10551160), (4, 5275580), (5, 4220464), (8, 2637790), (10, 2110232), (16, 1318895), (20, 1055116), (31, 680720), (40, 527558), (62, 340360), (67, 314960), (80, 263779), (124, 170180), (127, 166160), (134, 157480), (155, 136144), (248, 85090), (254, 83080), (268, 78740), (310, 68072), (335, 62992), (496, 42545), (508, 41540), (536, 39370), (620, 34036), (635, 33232), (670, 31496), (1016, 20770), (1072, 19685), (1240, 17018), (1270, 16616), (1340, 15748), (2032, 10385), (2077, 10160), (2480, 8509), (2540, 8308), (2680, 7874), (3937, 5360), (4154, 5080)]