21641255

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{191}}^1$

素因数の和:287

約数の個数: 32

約数和(自身を含む): 29196288

約数和(自身を除く): 7555033

約数列:

[1, 5, 17, 31, 43, 85, 155, 191, 215, 527, 731, 955, 1333, 2635, 3247, 3655, 5921, 6665, 8213, 16235, 22661, 29605, 41065, 100657, 113305, 139621, 254603, 503285, 698105, 1273015, 4328251, 21641255]

約数ペア:

[(1, 21641255), (5, 4328251), (17, 1273015), (31, 698105), (43, 503285), (85, 254603), (155, 139621), (191, 113305), (215, 100657), (527, 41065), (731, 29605), (955, 22661), (1333, 16235), (2635, 8213), (3247, 6665), (3655, 5921)]