21180400

素因数分解:

$2^4\times 5^2\times {\mathrm{52951}}^1$

素因数の和:52969

約数の個数: 30

約数和(自身を含む): 50886872

約数和(自身を除く): 29706472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 52951, 105902, 211804, 264755, 423608, 529510, 847216, 1059020, 1323775, 2118040, 2647550, 4236080, 5295100, 10590200, 21180400]

約数ペア:

[(1, 21180400), (2, 10590200), (4, 5295100), (5, 4236080), (8, 2647550), (10, 2118040), (16, 1323775), (20, 1059020), (25, 847216), (40, 529510), (50, 423608), (80, 264755), (100, 211804), (200, 105902), (400, 52951)]