20917995

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{113}}^1$

素因数の和:212

約数の個数: 64

約数和(自身を含む): 40449024

約数和(自身を除く): 19531029

約数列:

[1, 3, 5, 7, 15, 21, 35, 41, 43, 105, 113, 123, 129, 205, 215, 287, 301, 339, 565, 615, 645, 791, 861, 903, 1435, 1505, 1695, 1763, 2373, 3955, 4305, 4515, 4633, 4859, 5289, 8815, 11865, 12341, 13899, 14577, 23165, 24295, 26445, 32431, 34013, 37023, 61705, 69495, 72885, 97293, 102039, 162155, 170065, 185115, 199219, 486465, 510195, 597657, 996095, 1394533, 2988285, 4183599, 6972665, 20917995]

約数ペア:

[(1, 20917995), (3, 6972665), (5, 4183599), (7, 2988285), (15, 1394533), (21, 996095), (35, 597657), (41, 510195), (43, 486465), (105, 199219), (113, 185115), (123, 170065), (129, 162155), (205, 102039), (215, 97293), (287, 72885), (301, 69495), (339, 61705), (565, 37023), (615, 34013), (645, 32431), (791, 26445), (861, 24295), (903, 23165), (1435, 14577), (1505, 13899), (1695, 12341), (1763, 11865), (2373, 8815), (3955, 5289), (4305, 4859), (4515, 4633)]