20090720

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^2\times {\mathrm{743}}^1$

素因数の和:784

約数の個数: 72

約数和(自身を含む): 51465456

約数和(自身を除く): 31374736

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 169, 208, 260, 338, 416, 520, 676, 743, 845, 1040, 1352, 1486, 1690, 2080, 2704, 2972, 3380, 3715, 5408, 5944, 6760, 7430, 9659, 11888, 13520, 14860, 19318, 23776, 27040, 29720, 38636, 48295, 59440, 77272, 96590, 118880, 125567, 154544, 193180, 251134, 309088, 386360, 502268, 627835, 772720, 1004536, 1255670, 1545440, 2009072, 2511340, 4018144, 5022680, 10045360, 20090720]

約数ペア:

[(1, 20090720), (2, 10045360), (4, 5022680), (5, 4018144), (8, 2511340), (10, 2009072), (13, 1545440), (16, 1255670), (20, 1004536), (26, 772720), (32, 627835), (40, 502268), (52, 386360), (65, 309088), (80, 251134), (104, 193180), (130, 154544), (160, 125567), (169, 118880), (208, 96590), (260, 77272), (338, 59440), (416, 48295), (520, 38636), (676, 29720), (743, 27040), (845, 23776), (1040, 19318), (1352, 14860), (1486, 13520), (1690, 11888), (2080, 9659), (2704, 7430), (2972, 6760), (3380, 5944), (3715, 5408)]