21639280

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20807}}^1$

素因数の和:20833

約数の個数: 40

約数和(自身を含む): 54184032

約数和(自身を除く): 32544752

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20807, 41614, 83228, 104035, 166456, 208070, 270491, 332912, 416140, 540982, 832280, 1081964, 1352455, 1664560, 2163928, 2704910, 4327856, 5409820, 10819640, 21639280]

約数ペア:

[(1, 21639280), (2, 10819640), (4, 5409820), (5, 4327856), (8, 2704910), (10, 2163928), (13, 1664560), (16, 1352455), (20, 1081964), (26, 832280), (40, 540982), (52, 416140), (65, 332912), (80, 270491), (104, 208070), (130, 166456), (208, 104035), (260, 83228), (520, 41614), (1040, 20807)]