21609040

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15889}}^1$

素因数の和:15919

約数の個数: 40

約数和(自身を含む): 53199720

約数和(自身を除く): 31590680

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15889, 31778, 63556, 79445, 127112, 158890, 254224, 270113, 317780, 540226, 635560, 1080452, 1271120, 1350565, 2160904, 2701130, 4321808, 5402260, 10804520, 21609040]

約数ペア:

[(1, 21609040), (2, 10804520), (4, 5402260), (5, 4321808), (8, 2701130), (10, 2160904), (16, 1350565), (17, 1271120), (20, 1080452), (34, 635560), (40, 540226), (68, 317780), (80, 270113), (85, 254224), (136, 158890), (170, 127112), (272, 79445), (340, 63556), (680, 31778), (1360, 15889)]