19977820

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{401}}^1$

素因数の和:510

約数の個数: 48

約数和(自身を含む): 43763328

約数和(自身を除く): 23785508

約数列:

[1, 2, 4, 5, 10, 20, 47, 53, 94, 106, 188, 212, 235, 265, 401, 470, 530, 802, 940, 1060, 1604, 2005, 2491, 4010, 4982, 8020, 9964, 12455, 18847, 21253, 24910, 37694, 42506, 49820, 75388, 85012, 94235, 106265, 188470, 212530, 376940, 425060, 998891, 1997782, 3995564, 4994455, 9988910, 19977820]

約数ペア:

[(1, 19977820), (2, 9988910), (4, 4994455), (5, 3995564), (10, 1997782), (20, 998891), (47, 425060), (53, 376940), (94, 212530), (106, 188470), (188, 106265), (212, 94235), (235, 85012), (265, 75388), (401, 49820), (470, 42506), (530, 37694), (802, 24910), (940, 21253), (1060, 18847), (1604, 12455), (2005, 9964), (2491, 8020), (4010, 4982)]