18991980

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{15073}}^1$

素因数の和:15095

約数の個数: 72

約数和(自身を含む): 65843232

約数和(自身を除く): 46851252

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 15073, 30146, 45219, 60292, 75365, 90438, 105511, 135657, 150730, 180876, 211022, 226095, 271314, 301460, 316533, 422044, 452190, 527555, 542628, 633066, 678285, 904380, 949599, 1055110, 1266132, 1356570, 1582665, 1899198, 2110220, 2713140, 3165330, 3798396, 4747995, 6330660, 9495990, 18991980]

約数ペア:

[(1, 18991980), (2, 9495990), (3, 6330660), (4, 4747995), (5, 3798396), (6, 3165330), (7, 2713140), (9, 2110220), (10, 1899198), (12, 1582665), (14, 1356570), (15, 1266132), (18, 1055110), (20, 949599), (21, 904380), (28, 678285), (30, 633066), (35, 542628), (36, 527555), (42, 452190), (45, 422044), (60, 316533), (63, 301460), (70, 271314), (84, 226095), (90, 211022), (105, 180876), (126, 150730), (140, 135657), (180, 105511), (210, 90438), (252, 75365), (315, 60292), (420, 45219), (630, 30146), (1260, 15073)]