81998980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{293}}^1\times {\mathrm{1999}}^1$

素因数の和:2308

約数の個数: 48

約数和(自身を含む): 197568000

約数和(自身を除く): 115569020

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 293, 586, 1172, 1465, 1999, 2051, 2930, 3998, 4102, 5860, 7996, 8204, 9995, 10255, 13993, 19990, 20510, 27986, 39980, 41020, 55972, 69965, 139930, 279860, 585707, 1171414, 2342828, 2928535, 4099949, 5857070, 8199898, 11714140, 16399796, 20499745, 40999490, 81998980]

約数ペア:

[(1, 81998980), (2, 40999490), (4, 20499745), (5, 16399796), (7, 11714140), (10, 8199898), (14, 5857070), (20, 4099949), (28, 2928535), (35, 2342828), (70, 1171414), (140, 585707), (293, 279860), (586, 139930), (1172, 69965), (1465, 55972), (1999, 41020), (2051, 39980), (2930, 27986), (3998, 20510), (4102, 19990), (5860, 13993), (7996, 10255), (8204, 9995)]