21653420

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7789}}^1$

素因数の和:7937

約数の個数: 24

約数和(自身を含む): 45805200

約数和(自身を除く): 24151780

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7789, 15578, 31156, 38945, 77890, 155780, 1082671, 2165342, 4330684, 5413355, 10826710, 21653420]

約数ペア:

[(1, 21653420), (2, 10826710), (4, 5413355), (5, 4330684), (10, 2165342), (20, 1082671), (139, 155780), (278, 77890), (556, 38945), (695, 31156), (1390, 15578), (2780, 7789)]