20640555

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{619}}^1$

素因数の和:665

約数の個数: 64

約数和(自身を含む): 41664000

約数和(自身を除く): 21023445

約数列:

[1, 3, 5, 9, 13, 15, 19, 27, 39, 45, 57, 65, 95, 117, 135, 171, 195, 247, 285, 351, 513, 585, 619, 741, 855, 1235, 1755, 1857, 2223, 2565, 3095, 3705, 5571, 6669, 8047, 9285, 11115, 11761, 16713, 24141, 27855, 33345, 35283, 40235, 58805, 72423, 83565, 105849, 120705, 152893, 176415, 217269, 317547, 362115, 458679, 529245, 764465, 1086345, 1376037, 1587735, 2293395, 4128111, 6880185, 20640555]

約数ペア:

[(1, 20640555), (3, 6880185), (5, 4128111), (9, 2293395), (13, 1587735), (15, 1376037), (19, 1086345), (27, 764465), (39, 529245), (45, 458679), (57, 362115), (65, 317547), (95, 217269), (117, 176415), (135, 152893), (171, 120705), (195, 105849), (247, 83565), (285, 72423), (351, 58805), (513, 40235), (585, 35283), (619, 33345), (741, 27855), (855, 24141), (1235, 16713), (1755, 11761), (1857, 11115), (2223, 9285), (2565, 8047), (3095, 6669), (3705, 5571)]