21156205

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{641}}^1$

素因数の和:717

約数の個数: 32

約数和(自身を含む): 31062528

約数和(自身を除く): 9906323

約数列:

[1, 5, 7, 23, 35, 41, 115, 161, 205, 287, 641, 805, 943, 1435, 3205, 4487, 4715, 6601, 14743, 22435, 26281, 33005, 73715, 103201, 131405, 183967, 516005, 604463, 919835, 3022315, 4231241, 21156205]

約数ペア:

[(1, 21156205), (5, 4231241), (7, 3022315), (23, 919835), (35, 604463), (41, 516005), (115, 183967), (161, 131405), (205, 103201), (287, 73715), (641, 33005), (805, 26281), (943, 22435), (1435, 14743), (3205, 6601), (4487, 4715)]