400804520

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{244393}}^1$

素因数の和:244445

約数の個数: 32

約数和(自身を含む): 923809320

約数和(自身を除く): 523004800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 244393, 488786, 977572, 1221965, 1955144, 2443930, 4887860, 9775720, 10020113, 20040226, 40080452, 50100565, 80160904, 100201130, 200402260, 400804520]

約数ペア:

[(1, 400804520), (2, 200402260), (4, 100201130), (5, 80160904), (8, 50100565), (10, 40080452), (20, 20040226), (40, 10020113), (41, 9775720), (82, 4887860), (164, 2443930), (205, 1955144), (328, 1221965), (410, 977572), (820, 488786), (1640, 244393)]