20217921185

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{991}}^1\times {\mathrm{2789}}^1$

素因数の和:3822

約数の個数: 64

約数和(自身を含む): 31883673600

約数和(自身を除く): 11665752415

約数列:

[1, 5, 7, 11, 19, 35, 55, 77, 95, 133, 209, 385, 665, 991, 1045, 1463, 2789, 4955, 6937, 7315, 10901, 13945, 18829, 19523, 30679, 34685, 52991, 54505, 76307, 94145, 97615, 131803, 153395, 207119, 214753, 264955, 370937, 381535, 582901, 659015, 1035595, 1073765, 1449833, 1854685, 2763899, 2914505, 4080307, 7249165, 13819495, 19347293, 20401535, 30402889, 52514081, 96736465, 152014445, 212820223, 262570405, 367598567, 577654891, 1064101115, 1837992835, 2888274455, 4043584237, 20217921185]

約数ペア:

[(1, 20217921185), (5, 4043584237), (7, 2888274455), (11, 1837992835), (19, 1064101115), (35, 577654891), (55, 367598567), (77, 262570405), (95, 212820223), (133, 152014445), (209, 96736465), (385, 52514081), (665, 30402889), (991, 20401535), (1045, 19347293), (1463, 13819495), (2789, 7249165), (4955, 4080307), (6937, 2914505), (7315, 2763899), (10901, 1854685), (13945, 1449833), (18829, 1073765), (19523, 1035595), (30679, 659015), (34685, 582901), (52991, 381535), (54505, 370937), (76307, 264955), (94145, 214753), (97615, 207119), (131803, 153395)]