21408920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{3167}}^1$

素因数の和:3204

約数の個数: 48

約数和(自身を含む): 52176960

約数和(自身を除く): 30768040

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 169, 260, 338, 520, 676, 845, 1352, 1690, 3167, 3380, 6334, 6760, 12668, 15835, 25336, 31670, 41171, 63340, 82342, 126680, 164684, 205855, 329368, 411710, 535223, 823420, 1070446, 1646840, 2140892, 2676115, 4281784, 5352230, 10704460, 21408920]

約数ペア:

[(1, 21408920), (2, 10704460), (4, 5352230), (5, 4281784), (8, 2676115), (10, 2140892), (13, 1646840), (20, 1070446), (26, 823420), (40, 535223), (52, 411710), (65, 329368), (104, 205855), (130, 164684), (169, 126680), (260, 82342), (338, 63340), (520, 41171), (676, 31670), (845, 25336), (1352, 15835), (1690, 12668), (3167, 6760), (3380, 6334)]