21787515

素因数分解:

$3^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{811}}^1$

素因数の和:1024

約数の個数: 32

約数和(自身を含む): 38976000

約数和(自身を除く): 17188485

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 199, 597, 811, 995, 1791, 2433, 2985, 4055, 5373, 7299, 8955, 12165, 21897, 26865, 36495, 109485, 161389, 484167, 806945, 1452501, 2420835, 4357503, 7262505, 21787515]

約数ペア:

[(1, 21787515), (3, 7262505), (5, 4357503), (9, 2420835), (15, 1452501), (27, 806945), (45, 484167), (135, 161389), (199, 109485), (597, 36495), (811, 26865), (995, 21897), (1791, 12165), (2433, 8955), (2985, 7299), (4055, 5373)]