20439640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{1709}}^1$

素因数の和:1756

約数の個数: 64

約数和(自身を含む): 51710400

約数和(自身を除く): 31270760

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 23, 26, 40, 46, 52, 65, 92, 104, 115, 130, 184, 230, 260, 299, 460, 520, 598, 920, 1196, 1495, 1709, 2392, 2990, 3418, 5980, 6836, 8545, 11960, 13672, 17090, 22217, 34180, 39307, 44434, 68360, 78614, 88868, 111085, 157228, 177736, 196535, 222170, 314456, 393070, 444340, 510991, 786140, 888680, 1021982, 1572280, 2043964, 2554955, 4087928, 5109910, 10219820, 20439640]

約数ペア:

[(1, 20439640), (2, 10219820), (4, 5109910), (5, 4087928), (8, 2554955), (10, 2043964), (13, 1572280), (20, 1021982), (23, 888680), (26, 786140), (40, 510991), (46, 444340), (52, 393070), (65, 314456), (92, 222170), (104, 196535), (115, 177736), (130, 157228), (184, 111085), (230, 88868), (260, 78614), (299, 68360), (460, 44434), (520, 39307), (598, 34180), (920, 22217), (1196, 17090), (1495, 13672), (1709, 11960), (2392, 8545), (2990, 6836), (3418, 5980)]