20981350

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^3\times {\mathrm{191}}^1$

素因数の和:242

約数の個数: 48

約数和(自身を含む): 42497280

約数和(自身を除く): 21515930

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 169, 191, 325, 338, 382, 650, 845, 955, 1690, 1910, 2197, 2483, 4225, 4394, 4775, 4966, 8450, 9550, 10985, 12415, 21970, 24830, 32279, 54925, 62075, 64558, 109850, 124150, 161395, 322790, 419627, 806975, 839254, 1613950, 2098135, 4196270, 10490675, 20981350]

約数ペア:

[(1, 20981350), (2, 10490675), (5, 4196270), (10, 2098135), (13, 1613950), (25, 839254), (26, 806975), (50, 419627), (65, 322790), (130, 161395), (169, 124150), (191, 109850), (325, 64558), (338, 62075), (382, 54925), (650, 32279), (845, 24830), (955, 21970), (1690, 12415), (1910, 10985), (2197, 9550), (2483, 8450), (4225, 4966), (4394, 4775)]