19989207

素因数分解:

$3^3\times 7^2\times {\mathrm{29}}^1\times {\mathrm{521}}^1$

素因数の和:573

約数の個数: 48

約数和(自身を含む): 35704800

約数和(自身を除く): 15715593

約数列:

[1, 3, 7, 9, 21, 27, 29, 49, 63, 87, 147, 189, 203, 261, 441, 521, 609, 783, 1323, 1421, 1563, 1827, 3647, 4263, 4689, 5481, 10941, 12789, 14067, 15109, 25529, 32823, 38367, 45327, 76587, 98469, 105763, 135981, 229761, 317289, 407943, 689283, 740341, 951867, 2221023, 2855601, 6663069, 19989207]

約数ペア:

[(1, 19989207), (3, 6663069), (7, 2855601), (9, 2221023), (21, 951867), (27, 740341), (29, 689283), (49, 407943), (63, 317289), (87, 229761), (147, 135981), (189, 105763), (203, 98469), (261, 76587), (441, 45327), (521, 38367), (609, 32823), (783, 25529), (1323, 15109), (1421, 14067), (1563, 12789), (1827, 10941), (3647, 5481), (4263, 4689)]