21388015

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{97}}^1\times {\mathrm{211}}^1$

素因数の和:343

約数の個数: 32

約数和(自身を含む): 29917440

約数和(自身を除く): 8529425

約数列:

[1, 5, 11, 19, 55, 95, 97, 209, 211, 485, 1045, 1055, 1067, 1843, 2321, 4009, 5335, 9215, 11605, 20045, 20273, 20467, 44099, 101365, 102335, 220495, 225137, 388873, 1125685, 1944365, 4277603, 21388015]

約数ペア:

[(1, 21388015), (5, 4277603), (11, 1944365), (19, 1125685), (55, 388873), (95, 225137), (97, 220495), (209, 102335), (211, 101365), (485, 44099), (1045, 20467), (1055, 20273), (1067, 20045), (1843, 11605), (2321, 9215), (4009, 5335)]