18978280

素因数分解:

$2^3\times 5^1\times {\mathrm{541}}^1\times {\mathrm{877}}^1$

素因数の和:1429

約数の個数: 32

約数和(自身を含む): 42828840

約数和(自身を除く): 23850560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 541, 877, 1082, 1754, 2164, 2705, 3508, 4328, 4385, 5410, 7016, 8770, 10820, 17540, 21640, 35080, 474457, 948914, 1897828, 2372285, 3795656, 4744570, 9489140, 18978280]

約数ペア:

[(1, 18978280), (2, 9489140), (4, 4744570), (5, 3795656), (8, 2372285), (10, 1897828), (20, 948914), (40, 474457), (541, 35080), (877, 21640), (1082, 17540), (1754, 10820), (2164, 8770), (2705, 7016), (3508, 5410), (4328, 4385)]