644799220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{190769}}^1$

素因数の和:190804

約数の個数: 36

約数和(自身を含む): 1466258220

約数和(自身を除く): 821459000

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 190769, 381538, 763076, 953845, 1907690, 2479997, 3815380, 4959994, 9919988, 12399985, 24799970, 32239961, 49599940, 64479922, 128959844, 161199805, 322399610, 644799220]

約数ペア:

[(1, 644799220), (2, 322399610), (4, 161199805), (5, 128959844), (10, 64479922), (13, 49599940), (20, 32239961), (26, 24799970), (52, 12399985), (65, 9919988), (130, 4959994), (169, 3815380), (260, 2479997), (338, 1907690), (676, 953845), (845, 763076), (1690, 381538), (3380, 190769)]