19980555

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^2\times {\mathrm{139}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 37820160

約数和(自身を除く): 17839605

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 105, 111, 139, 185, 259, 417, 555, 695, 777, 973, 1295, 1369, 2085, 2919, 3885, 4107, 4865, 5143, 6845, 9583, 14595, 15429, 20535, 25715, 28749, 36001, 47915, 77145, 108003, 143745, 180005, 190291, 540015, 570873, 951455, 1332037, 2854365, 3996111, 6660185, 19980555]

約数ペア:

[(1, 19980555), (3, 6660185), (5, 3996111), (7, 2854365), (15, 1332037), (21, 951455), (35, 570873), (37, 540015), (105, 190291), (111, 180005), (139, 143745), (185, 108003), (259, 77145), (417, 47915), (555, 36001), (695, 28749), (777, 25715), (973, 20535), (1295, 15429), (1369, 14595), (2085, 9583), (2919, 6845), (3885, 5143), (4107, 4865)]