20999925

素因数分解:

$3^3\times 5^2\times {\mathrm{53}}^1\times {\mathrm{587}}^1$

素因数の和:659

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 18372555

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 53, 75, 135, 159, 225, 265, 477, 587, 675, 795, 1325, 1431, 1761, 2385, 2935, 3975, 5283, 7155, 8805, 11925, 14675, 15849, 26415, 31111, 35775, 44025, 79245, 93333, 132075, 155555, 279999, 396225, 466665, 777775, 839997, 1399995, 2333325, 4199985, 6999975, 20999925]

約数ペア:

[(1, 20999925), (3, 6999975), (5, 4199985), (9, 2333325), (15, 1399995), (25, 839997), (27, 777775), (45, 466665), (53, 396225), (75, 279999), (135, 155555), (159, 132075), (225, 93333), (265, 79245), (477, 44025), (587, 35775), (675, 31111), (795, 26415), (1325, 15849), (1431, 14675), (1761, 11925), (2385, 8805), (2935, 7155), (3975, 5283)]