19871215

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{367}}^1$

素因数の和:416

約数の個数: 48

約数和(自身を含む): 31715712

約数和(自身を除く): 11844497

約数列:

[1, 5, 7, 13, 17, 35, 49, 65, 85, 91, 119, 221, 245, 367, 455, 595, 637, 833, 1105, 1547, 1835, 2569, 3185, 4165, 4771, 6239, 7735, 10829, 12845, 17983, 23855, 31195, 33397, 43673, 54145, 81107, 89915, 166985, 218365, 233779, 305711, 405535, 567749, 1168895, 1528555, 2838745, 3974243, 19871215]

約数ペア:

[(1, 19871215), (5, 3974243), (7, 2838745), (13, 1528555), (17, 1168895), (35, 567749), (49, 405535), (65, 305711), (85, 233779), (91, 218365), (119, 166985), (221, 89915), (245, 81107), (367, 54145), (455, 43673), (595, 33397), (637, 31195), (833, 23855), (1105, 17983), (1547, 12845), (1835, 10829), (2569, 7735), (3185, 6239), (4165, 4771)]