19891900

素因数分解:

$2^2\times 5^2\times 7^1\times {\mathrm{157}}^1\times {\mathrm{181}}^1$

素因数の和:359

約数の個数: 72

約数和(自身を含む): 49920416

約数和(自身を除く): 30028516

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 50, 70, 100, 140, 157, 175, 181, 314, 350, 362, 628, 700, 724, 785, 905, 1099, 1267, 1570, 1810, 2198, 2534, 3140, 3620, 3925, 4396, 4525, 5068, 5495, 6335, 7850, 9050, 10990, 12670, 15700, 18100, 21980, 25340, 27475, 28417, 31675, 54950, 56834, 63350, 109900, 113668, 126700, 142085, 198919, 284170, 397838, 568340, 710425, 795676, 994595, 1420850, 1989190, 2841700, 3978380, 4972975, 9945950, 19891900]

約数ペア:

[(1, 19891900), (2, 9945950), (4, 4972975), (5, 3978380), (7, 2841700), (10, 1989190), (14, 1420850), (20, 994595), (25, 795676), (28, 710425), (35, 568340), (50, 397838), (70, 284170), (100, 198919), (140, 142085), (157, 126700), (175, 113668), (181, 109900), (314, 63350), (350, 56834), (362, 54950), (628, 31675), (700, 28417), (724, 27475), (785, 25340), (905, 21980), (1099, 18100), (1267, 15700), (1570, 12670), (1810, 10990), (2198, 9050), (2534, 7850), (3140, 6335), (3620, 5495), (3925, 5068), (4396, 4525)]