18938140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^3\times {\mathrm{431}}^1$

素因数の和:479

約数の個数: 48

約数和(自身を含む): 43182720

約数和(自身を除く): 24244580

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 431, 676, 845, 862, 1690, 1724, 2155, 2197, 3380, 4310, 4394, 5603, 8620, 8788, 10985, 11206, 21970, 22412, 28015, 43940, 56030, 72839, 112060, 145678, 291356, 364195, 728390, 946907, 1456780, 1893814, 3787628, 4734535, 9469070, 18938140]

約数ペア:

[(1, 18938140), (2, 9469070), (4, 4734535), (5, 3787628), (10, 1893814), (13, 1456780), (20, 946907), (26, 728390), (52, 364195), (65, 291356), (130, 145678), (169, 112060), (260, 72839), (338, 56030), (431, 43940), (676, 28015), (845, 22412), (862, 21970), (1690, 11206), (1724, 10985), (2155, 8788), (2197, 8620), (3380, 5603), (4310, 4394)]