21097765

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{313}}^1$

素因数の和:409

約数の個数: 32

約数和(自身を含む): 29435616

約数和(自身を除く): 8337851

約数列:

[1, 5, 13, 17, 61, 65, 85, 221, 305, 313, 793, 1037, 1105, 1565, 3965, 4069, 5185, 5321, 13481, 19093, 20345, 26605, 67405, 69173, 95465, 248209, 324581, 345865, 1241045, 1622905, 4219553, 21097765]

約数ペア:

[(1, 21097765), (5, 4219553), (13, 1622905), (17, 1241045), (61, 345865), (65, 324581), (85, 248209), (221, 95465), (305, 69173), (313, 67405), (793, 26605), (1037, 20345), (1105, 19093), (1565, 13481), (3965, 5321), (4069, 5185)]