19878719

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{101}}^1\times {\mathrm{907}}^1$

素因数の和:1046

約数の個数: 16

約数和(自身を含む): 23709696

約数和(自身を除く): 3830977

約数列:

[1, 7, 31, 101, 217, 707, 907, 3131, 6349, 21917, 28117, 91607, 196819, 641249, 2839817, 19878719]

約数ペア:

[(1, 19878719), (7, 2839817), (31, 641249), (101, 196819), (217, 91607), (707, 28117), (907, 21917), (3131, 6349)]