20391995

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{139}}^1$

素因数の和:255

約数の個数: 32

約数和(自身を含む): 27706560

約数和(自身を除く): 7314565

約数列:

[1, 5, 13, 37, 61, 65, 139, 185, 305, 481, 695, 793, 1807, 2257, 2405, 3965, 5143, 8479, 9035, 11285, 25715, 29341, 42395, 66859, 110227, 146705, 313723, 334295, 551135, 1568615, 4078399, 20391995]

約数ペア:

[(1, 20391995), (5, 4078399), (13, 1568615), (37, 551135), (61, 334295), (65, 313723), (139, 146705), (185, 110227), (305, 66859), (481, 42395), (695, 29341), (793, 25715), (1807, 11285), (2257, 9035), (2405, 8479), (3965, 5143)]