18889900

素因数分解:

$2^2\times 5^2\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{191}}^1$

素因数の和:271

約数の個数: 72

約数和(自身を含む): 43997184

約数和(自身を除く): 25107284

約数列:

[1, 2, 4, 5, 10, 20, 23, 25, 43, 46, 50, 86, 92, 100, 115, 172, 191, 215, 230, 382, 430, 460, 575, 764, 860, 955, 989, 1075, 1150, 1910, 1978, 2150, 2300, 3820, 3956, 4300, 4393, 4775, 4945, 8213, 8786, 9550, 9890, 16426, 17572, 19100, 19780, 21965, 24725, 32852, 41065, 43930, 49450, 82130, 87860, 98900, 109825, 164260, 188899, 205325, 219650, 377798, 410650, 439300, 755596, 821300, 944495, 1888990, 3777980, 4722475, 9444950, 18889900]

約数ペア:

[(1, 18889900), (2, 9444950), (4, 4722475), (5, 3777980), (10, 1888990), (20, 944495), (23, 821300), (25, 755596), (43, 439300), (46, 410650), (50, 377798), (86, 219650), (92, 205325), (100, 188899), (115, 164260), (172, 109825), (191, 98900), (215, 87860), (230, 82130), (382, 49450), (430, 43930), (460, 41065), (575, 32852), (764, 24725), (860, 21965), (955, 19780), (989, 19100), (1075, 17572), (1150, 16426), (1910, 9890), (1978, 9550), (2150, 8786), (2300, 8213), (3820, 4945), (3956, 4775), (4300, 4393)]