19981780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{10979}}^1$

素因数の和:11008

約数の個数: 48

約数和(自身を含む): 51649920

約数和(自身を除く): 31668140

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 10979, 21958, 43916, 54895, 76853, 109790, 142727, 153706, 219580, 285454, 307412, 384265, 570908, 713635, 768530, 999089, 1427270, 1537060, 1998178, 2854540, 3996356, 4995445, 9990890, 19981780]

約数ペア:

[(1, 19981780), (2, 9990890), (4, 4995445), (5, 3996356), (7, 2854540), (10, 1998178), (13, 1537060), (14, 1427270), (20, 999089), (26, 768530), (28, 713635), (35, 570908), (52, 384265), (65, 307412), (70, 285454), (91, 219580), (130, 153706), (140, 142727), (182, 109790), (260, 76853), (364, 54895), (455, 43916), (910, 21958), (1820, 10979)]