21188830

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{389}}^1\times {\mathrm{419}}^1$

素因数の和:828

約数の個数: 32

約数和(自身を含む): 41277600

約数和(自身を除く): 20088770

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 389, 419, 778, 838, 1945, 2095, 3890, 4190, 5057, 5447, 10114, 10894, 25285, 27235, 50570, 54470, 162991, 325982, 814955, 1629910, 2118883, 4237766, 10594415, 21188830]

約数ペア:

[(1, 21188830), (2, 10594415), (5, 4237766), (10, 2118883), (13, 1629910), (26, 814955), (65, 325982), (130, 162991), (389, 54470), (419, 50570), (778, 27235), (838, 25285), (1945, 10894), (2095, 10114), (3890, 5447), (4190, 5057)]