21386780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{2447}}^1$

素因数の和:2498

約数の個数: 48

約数和(自身を含む): 49351680

約数和(自身を除く): 27964900

約数列:

[1, 2, 4, 5, 10, 19, 20, 23, 38, 46, 76, 92, 95, 115, 190, 230, 380, 437, 460, 874, 1748, 2185, 2447, 4370, 4894, 8740, 9788, 12235, 24470, 46493, 48940, 56281, 92986, 112562, 185972, 225124, 232465, 281405, 464930, 562810, 929860, 1069339, 1125620, 2138678, 4277356, 5346695, 10693390, 21386780]

約数ペア:

[(1, 21386780), (2, 10693390), (4, 5346695), (5, 4277356), (10, 2138678), (19, 1125620), (20, 1069339), (23, 929860), (38, 562810), (46, 464930), (76, 281405), (92, 232465), (95, 225124), (115, 185972), (190, 112562), (230, 92986), (380, 56281), (437, 48940), (460, 46493), (874, 24470), (1748, 12235), (2185, 9788), (2447, 8740), (4370, 4894)]