8400000020

素因数分解:

$2^2\times 5^1\times {\mathrm{487}}^1\times {\mathrm{862423}}^1$

素因数の和:862919

約数の個数: 24

約数和(自身を含む): 17676242304

約数和(自身を除く): 9276242284

約数列:

[1, 2, 4, 5, 10, 20, 487, 974, 1948, 2435, 4870, 9740, 862423, 1724846, 3449692, 4312115, 8624230, 17248460, 420000001, 840000002, 1680000004, 2100000005, 4200000010, 8400000020]

約数ペア:

[(1, 8400000020), (2, 4200000010), (4, 2100000005), (5, 1680000004), (10, 840000002), (20, 420000001), (487, 17248460), (974, 8624230), (1948, 4312115), (2435, 3449692), (4870, 1724846), (9740, 862423)]