641840

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{113}}^1$

素因数の和:197

約数の個数: 40

約数和(自身を含む): 1526688

約数和(自身を除く): 884848

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 113, 142, 226, 284, 355, 452, 565, 568, 710, 904, 1130, 1136, 1420, 1808, 2260, 2840, 4520, 5680, 8023, 9040, 16046, 32092, 40115, 64184, 80230, 128368, 160460, 320920, 641840]

約数ペア:

[(1, 641840), (2, 320920), (4, 160460), (5, 128368), (8, 80230), (10, 64184), (16, 40115), (20, 32092), (40, 16046), (71, 9040), (80, 8023), (113, 5680), (142, 4520), (226, 2840), (284, 2260), (355, 1808), (452, 1420), (565, 1136), (568, 1130), (710, 904)]