21655915

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{101}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 28837440

約数和(自身を除く): 7181525

約数列:

[1, 5, 19, 37, 61, 95, 101, 185, 305, 505, 703, 1159, 1919, 2257, 3515, 3737, 5795, 6161, 9595, 11285, 18685, 30805, 42883, 71003, 117059, 214415, 227957, 355015, 585295, 1139785, 4331183, 21655915]

約数ペア:

[(1, 21655915), (5, 4331183), (19, 1139785), (37, 585295), (61, 355015), (95, 227957), (101, 214415), (185, 117059), (305, 71003), (505, 42883), (703, 30805), (1159, 18685), (1919, 11285), (2257, 9595), (3515, 6161), (3737, 5795)]