19980513

素因数分解:

$3^4\times 7^1\times {\mathrm{131}}^1\times {\mathrm{269}}^1$

素因数の和:419

約数の個数: 40

約数和(自身を含む): 34499520

約数和(自身を除く): 14519007

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 131, 189, 269, 393, 567, 807, 917, 1179, 1883, 2421, 2751, 3537, 5649, 7263, 8253, 10611, 16947, 21789, 24759, 35239, 50841, 74277, 105717, 152523, 246673, 317151, 740019, 951453, 2220057, 2854359, 6660171, 19980513]

約数ペア:

[(1, 19980513), (3, 6660171), (7, 2854359), (9, 2220057), (21, 951453), (27, 740019), (63, 317151), (81, 246673), (131, 152523), (189, 105717), (269, 74277), (393, 50841), (567, 35239), (807, 24759), (917, 21789), (1179, 16947), (1883, 10611), (2421, 8253), (2751, 7263), (3537, 5649)]