128778880

素因数分解:

$2^7\times 5^1\times {\mathrm{311}}^1\times {\mathrm{647}}^1$

素因数の和:977

約数の個数: 64

約数和(自身を含む): 309329280

約数和(自身を除く): 180550400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 311, 320, 622, 640, 647, 1244, 1294, 1555, 2488, 2588, 3110, 3235, 4976, 5176, 6220, 6470, 9952, 10352, 12440, 12940, 19904, 20704, 24880, 25880, 39808, 41408, 49760, 51760, 82816, 99520, 103520, 199040, 201217, 207040, 402434, 414080, 804868, 1006085, 1609736, 2012170, 3219472, 4024340, 6438944, 8048680, 12877888, 16097360, 25755776, 32194720, 64389440, 128778880]

約数ペア:

[(1, 128778880), (2, 64389440), (4, 32194720), (5, 25755776), (8, 16097360), (10, 12877888), (16, 8048680), (20, 6438944), (32, 4024340), (40, 3219472), (64, 2012170), (80, 1609736), (128, 1006085), (160, 804868), (311, 414080), (320, 402434), (622, 207040), (640, 201217), (647, 199040), (1244, 103520), (1294, 99520), (1555, 82816), (2488, 51760), (2588, 49760), (3110, 41408), (3235, 39808), (4976, 25880), (5176, 24880), (6220, 20704), (6470, 19904), (9952, 12940), (10352, 12440)]