19561780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{19961}}^1$

素因数の和:19984

約数の個数: 36

約数和(自身を含む): 47789028

約数和(自身を除く): 28227248

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 19961, 39922, 79844, 99805, 139727, 199610, 279454, 399220, 558908, 698635, 978089, 1397270, 1956178, 2794540, 3912356, 4890445, 9780890, 19561780]

約数ペア:

[(1, 19561780), (2, 9780890), (4, 4890445), (5, 3912356), (7, 2794540), (10, 1956178), (14, 1397270), (20, 978089), (28, 698635), (35, 558908), (49, 399220), (70, 279454), (98, 199610), (140, 139727), (196, 99805), (245, 79844), (490, 39922), (980, 19961)]