20712915

素因数分解:

$3^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{257}}^1$

素因数の和:473

約数の個数: 40

約数和(自身を含む): 37461600

約数和(自身を除く): 16748685

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 199, 257, 405, 597, 771, 995, 1285, 1791, 2313, 2985, 3855, 5373, 6939, 8955, 11565, 16119, 20817, 26865, 34695, 51143, 80595, 104085, 153429, 255715, 460287, 767145, 1380861, 2301435, 4142583, 6904305, 20712915]

約数ペア:

[(1, 20712915), (3, 6904305), (5, 4142583), (9, 2301435), (15, 1380861), (27, 767145), (45, 460287), (81, 255715), (135, 153429), (199, 104085), (257, 80595), (405, 51143), (597, 34695), (771, 26865), (995, 20817), (1285, 16119), (1791, 11565), (2313, 8955), (2985, 6939), (3855, 5373)]