20765680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{487}}^1$

素因数の和:554

約数の個数: 80

約数和(自身を含む): 53371584

約数和(自身を除く): 32605904

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 41, 52, 65, 80, 82, 104, 130, 164, 205, 208, 260, 328, 410, 487, 520, 533, 656, 820, 974, 1040, 1066, 1640, 1948, 2132, 2435, 2665, 3280, 3896, 4264, 4870, 5330, 6331, 7792, 8528, 9740, 10660, 12662, 19480, 19967, 21320, 25324, 31655, 38960, 39934, 42640, 50648, 63310, 79868, 99835, 101296, 126620, 159736, 199670, 253240, 259571, 319472, 399340, 506480, 519142, 798680, 1038284, 1297855, 1597360, 2076568, 2595710, 4153136, 5191420, 10382840, 20765680]

約数ペア:

[(1, 20765680), (2, 10382840), (4, 5191420), (5, 4153136), (8, 2595710), (10, 2076568), (13, 1597360), (16, 1297855), (20, 1038284), (26, 798680), (40, 519142), (41, 506480), (52, 399340), (65, 319472), (80, 259571), (82, 253240), (104, 199670), (130, 159736), (164, 126620), (205, 101296), (208, 99835), (260, 79868), (328, 63310), (410, 50648), (487, 42640), (520, 39934), (533, 38960), (656, 31655), (820, 25324), (974, 21320), (1040, 19967), (1066, 19480), (1640, 12662), (1948, 10660), (2132, 9740), (2435, 8528), (2665, 7792), (3280, 6331), (3896, 5330), (4264, 4870)]