21289940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{241}}^1\times {\mathrm{631}}^1$

素因数の和:888

約数の個数: 48

約数和(自身を含む): 51389184

約数和(自身を除く): 30099244

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 241, 482, 631, 964, 1205, 1262, 1687, 2410, 2524, 3155, 3374, 4417, 4820, 6310, 6748, 8435, 8834, 12620, 16870, 17668, 22085, 33740, 44170, 88340, 152071, 304142, 608284, 760355, 1064497, 1520710, 2128994, 3041420, 4257988, 5322485, 10644970, 21289940]

約数ペア:

[(1, 21289940), (2, 10644970), (4, 5322485), (5, 4257988), (7, 3041420), (10, 2128994), (14, 1520710), (20, 1064497), (28, 760355), (35, 608284), (70, 304142), (140, 152071), (241, 88340), (482, 44170), (631, 33740), (964, 22085), (1205, 17668), (1262, 16870), (1687, 12620), (2410, 8834), (2524, 8435), (3155, 6748), (3374, 6310), (4417, 4820)]