19905080

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{379}}^1$

素因数の和:504

約数の個数: 64

約数和(自身を含む): 48837600

約数和(自身を除く): 28932520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 101, 104, 130, 202, 260, 379, 404, 505, 520, 758, 808, 1010, 1313, 1516, 1895, 2020, 2626, 3032, 3790, 4040, 4927, 5252, 6565, 7580, 9854, 10504, 13130, 15160, 19708, 24635, 26260, 38279, 39416, 49270, 52520, 76558, 98540, 153116, 191395, 197080, 306232, 382790, 497627, 765580, 995254, 1531160, 1990508, 2488135, 3981016, 4976270, 9952540, 19905080]

約数ペア:

[(1, 19905080), (2, 9952540), (4, 4976270), (5, 3981016), (8, 2488135), (10, 1990508), (13, 1531160), (20, 995254), (26, 765580), (40, 497627), (52, 382790), (65, 306232), (101, 197080), (104, 191395), (130, 153116), (202, 98540), (260, 76558), (379, 52520), (404, 49270), (505, 39416), (520, 38279), (758, 26260), (808, 24635), (1010, 19708), (1313, 15160), (1516, 13130), (1895, 10504), (2020, 9854), (2626, 7580), (3032, 6565), (3790, 5252), (4040, 4927)]