21025420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{419}}^1$

素因数の和:634

約数の個数: 48

約数和(自身を含む): 47910240

約数和(自身を除く): 26884820

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 193, 260, 386, 419, 772, 838, 965, 1676, 1930, 2095, 2509, 3860, 4190, 5018, 5447, 8380, 10036, 10894, 12545, 21788, 25090, 27235, 50180, 54470, 80867, 108940, 161734, 323468, 404335, 808670, 1051271, 1617340, 2102542, 4205084, 5256355, 10512710, 21025420]

約数ペア:

[(1, 21025420), (2, 10512710), (4, 5256355), (5, 4205084), (10, 2102542), (13, 1617340), (20, 1051271), (26, 808670), (52, 404335), (65, 323468), (130, 161734), (193, 108940), (260, 80867), (386, 54470), (419, 50180), (772, 27235), (838, 25090), (965, 21788), (1676, 12545), (1930, 10894), (2095, 10036), (2509, 8380), (3860, 5447), (4190, 5018)]