20998540

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{191}}^1\times {\mathrm{239}}^1$

素因数の和:462

約数の個数: 48

約数和(自身を含む): 46448640

約数和(自身を除く): 25450100

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 115, 191, 230, 239, 382, 460, 478, 764, 955, 956, 1195, 1910, 2390, 3820, 4393, 4780, 5497, 8786, 10994, 17572, 21965, 21988, 27485, 43930, 45649, 54970, 87860, 91298, 109940, 182596, 228245, 456490, 912980, 1049927, 2099854, 4199708, 5249635, 10499270, 20998540]

約数ペア:

[(1, 20998540), (2, 10499270), (4, 5249635), (5, 4199708), (10, 2099854), (20, 1049927), (23, 912980), (46, 456490), (92, 228245), (115, 182596), (191, 109940), (230, 91298), (239, 87860), (382, 54970), (460, 45649), (478, 43930), (764, 27485), (955, 21988), (956, 21965), (1195, 17572), (1910, 10994), (2390, 8786), (3820, 5497), (4393, 4780)]