21507955

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{461}}^1$

素因数の和:547

約数の個数: 32

約数和(自身を含む): 31223808

約数和(自身を除く): 9715853

約数列:

[1, 5, 7, 31, 35, 43, 155, 215, 217, 301, 461, 1085, 1333, 1505, 2305, 3227, 6665, 9331, 14291, 16135, 19823, 46655, 71455, 99115, 100037, 138761, 500185, 614513, 693805, 3072565, 4301591, 21507955]

約数ペア:

[(1, 21507955), (5, 4301591), (7, 3072565), (31, 693805), (35, 614513), (43, 500185), (155, 138761), (215, 100037), (217, 99115), (301, 71455), (461, 46655), (1085, 19823), (1333, 16135), (1505, 14291), (2305, 9331), (3227, 6665)]