21398780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^3\times {\mathrm{487}}^1$

素因数の和:535

約数の個数: 48

約数和(自身を含む): 48780480

約数和(自身を除く): 27381700

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 487, 676, 845, 974, 1690, 1948, 2197, 2435, 3380, 4394, 4870, 6331, 8788, 9740, 10985, 12662, 21970, 25324, 31655, 43940, 63310, 82303, 126620, 164606, 329212, 411515, 823030, 1069939, 1646060, 2139878, 4279756, 5349695, 10699390, 21398780]

約数ペア:

[(1, 21398780), (2, 10699390), (4, 5349695), (5, 4279756), (10, 2139878), (13, 1646060), (20, 1069939), (26, 823030), (52, 411515), (65, 329212), (130, 164606), (169, 126620), (260, 82303), (338, 63310), (487, 43940), (676, 31655), (845, 25324), (974, 21970), (1690, 12662), (1948, 10985), (2197, 9740), (2435, 8788), (3380, 6331), (4394, 4870)]