19720980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{331}}^2$

素因数の和:677

約数の個数: 54

約数和(自身を含む): 60001578

約数和(自身を除く): 40280598

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 331, 662, 993, 1324, 1655, 1986, 2979, 3310, 3972, 4965, 5958, 6620, 9930, 11916, 14895, 19860, 29790, 59580, 109561, 219122, 328683, 438244, 547805, 657366, 986049, 1095610, 1314732, 1643415, 1972098, 2191220, 3286830, 3944196, 4930245, 6573660, 9860490, 19720980]

約数ペア:

[(1, 19720980), (2, 9860490), (3, 6573660), (4, 4930245), (5, 3944196), (6, 3286830), (9, 2191220), (10, 1972098), (12, 1643415), (15, 1314732), (18, 1095610), (20, 986049), (30, 657366), (36, 547805), (45, 438244), (60, 328683), (90, 219122), (180, 109561), (331, 59580), (662, 29790), (993, 19860), (1324, 14895), (1655, 11916), (1986, 9930), (2979, 6620), (3310, 5958), (3972, 4965)]