21281800

素因数分解:

$2^3\times 5^2\times {\mathrm{97}}^1\times {\mathrm{1097}}^1$

素因数の和:1210

約数の個数: 48

約数和(自身を含む): 50035860

約数和(自身を除く): 28754060

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 97, 100, 194, 200, 388, 485, 776, 970, 1097, 1940, 2194, 2425, 3880, 4388, 4850, 5485, 8776, 9700, 10970, 19400, 21940, 27425, 43880, 54850, 106409, 109700, 212818, 219400, 425636, 532045, 851272, 1064090, 2128180, 2660225, 4256360, 5320450, 10640900, 21281800]

約数ペア:

[(1, 21281800), (2, 10640900), (4, 5320450), (5, 4256360), (8, 2660225), (10, 2128180), (20, 1064090), (25, 851272), (40, 532045), (50, 425636), (97, 219400), (100, 212818), (194, 109700), (200, 106409), (388, 54850), (485, 43880), (776, 27425), (970, 21940), (1097, 19400), (1940, 10970), (2194, 9700), (2425, 8776), (3880, 5485), (4388, 4850)]