21005138360

素因数分解:

$2^3\times 5^1\times {\mathrm{18121}}^1\times {\mathrm{28979}}^1$

素因数の和:47111

約数の個数: 32

約数和(自身を含む): 47265800400

約数和(自身を除く): 26260662040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 18121, 28979, 36242, 57958, 72484, 90605, 115916, 144895, 144968, 181210, 231832, 289790, 362420, 579580, 724840, 1159160, 525128459, 1050256918, 2100513836, 2625642295, 4201027672, 5251284590, 10502569180, 21005138360]

約数ペア:

[(1, 21005138360), (2, 10502569180), (4, 5251284590), (5, 4201027672), (8, 2625642295), (10, 2100513836), (20, 1050256918), (40, 525128459), (18121, 1159160), (28979, 724840), (36242, 579580), (57958, 362420), (72484, 289790), (90605, 231832), (115916, 181210), (144895, 144968)]