816400

素因数分解:

$2^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{157}}^1$

素因数の和:188

約数の個数: 60

約数和(自身を含む): 2125732

約数和(自身を除く): 1309332

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 40, 50, 52, 65, 80, 100, 104, 130, 157, 200, 208, 260, 314, 325, 400, 520, 628, 650, 785, 1040, 1256, 1300, 1570, 2041, 2512, 2600, 3140, 3925, 4082, 5200, 6280, 7850, 8164, 10205, 12560, 15700, 16328, 20410, 31400, 32656, 40820, 51025, 62800, 81640, 102050, 163280, 204100, 408200, 816400]

約数ペア:

[(1, 816400), (2, 408200), (4, 204100), (5, 163280), (8, 102050), (10, 81640), (13, 62800), (16, 51025), (20, 40820), (25, 32656), (26, 31400), (40, 20410), (50, 16328), (52, 15700), (65, 12560), (80, 10205), (100, 8164), (104, 7850), (130, 6280), (157, 5200), (200, 4082), (208, 3925), (260, 3140), (314, 2600), (325, 2512), (400, 2041), (520, 1570), (628, 1300), (650, 1256), (785, 1040)]