78400640

素因数分解:

$2^7\times 5^1\times {\mathrm{122501}}^1$

素因数の和:122520

約数の個数: 32

約数和(自身を含む): 187428060

約数和(自身を除く): 109027420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 122501, 245002, 490004, 612505, 980008, 1225010, 1960016, 2450020, 3920032, 4900040, 7840064, 9800080, 15680128, 19600160, 39200320, 78400640]

約数ペア:

[(1, 78400640), (2, 39200320), (4, 19600160), (5, 15680128), (8, 9800080), (10, 7840064), (16, 4900040), (20, 3920032), (32, 2450020), (40, 1960016), (64, 1225010), (80, 980008), (128, 612505), (160, 490004), (320, 245002), (640, 122501)]