21142755

素因数分解:

$3^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{787}}^1$

素因数の和:1000

約数の個数: 32

約数和(自身を含む): 37824000

約数和(自身を除く): 16681245

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 199, 597, 787, 995, 1791, 2361, 2985, 3935, 5373, 7083, 8955, 11805, 21249, 26865, 35415, 106245, 156613, 469839, 783065, 1409517, 2349195, 4228551, 7047585, 21142755]

約数ペア:

[(1, 21142755), (3, 7047585), (5, 4228551), (9, 2349195), (15, 1409517), (27, 783065), (45, 469839), (135, 156613), (199, 106245), (597, 35415), (787, 26865), (995, 21249), (1791, 11805), (2361, 8955), (2985, 7083), (3935, 5373)]