20012920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12203}}^1$

素因数の和:12255

約数の個数: 32

約数和(自身を含む): 46131120

約数和(自身を除く): 26118200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12203, 24406, 48812, 61015, 97624, 122030, 244060, 488120, 500323, 1000646, 2001292, 2501615, 4002584, 5003230, 10006460, 20012920]

約数ペア:

[(1, 20012920), (2, 10006460), (4, 5003230), (5, 4002584), (8, 2501615), (10, 2001292), (20, 1000646), (40, 500323), (41, 488120), (82, 244060), (164, 122030), (205, 97624), (328, 61015), (410, 48812), (820, 24406), (1640, 12203)]