18720002

素因数分解:

$2^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{509}}^1$

素因数の和:626

約数の個数: 32

約数和(自身を含む): 33488640

約数和(自身を除く): 14768638

約数列:

[1, 2, 7, 14, 37, 71, 74, 142, 259, 497, 509, 518, 994, 1018, 2627, 3563, 5254, 7126, 18389, 18833, 36139, 36778, 37666, 72278, 131831, 252973, 263662, 505946, 1337143, 2674286, 9360001, 18720002]

約数ペア:

[(1, 18720002), (2, 9360001), (7, 2674286), (14, 1337143), (37, 505946), (71, 263662), (74, 252973), (142, 131831), (259, 72278), (497, 37666), (509, 36778), (518, 36139), (994, 18833), (1018, 18389), (2627, 7126), (3563, 5254)]