21679850

素因数分解:

$2^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{197}}^1$

素因数の和:311

約数の個数: 48

約数和(自身を含む): 42425856

約数和(自身を除く): 20746006

約数列:

[1, 2, 5, 10, 25, 31, 50, 62, 71, 142, 155, 197, 310, 355, 394, 710, 775, 985, 1550, 1775, 1970, 2201, 3550, 4402, 4925, 6107, 9850, 11005, 12214, 13987, 22010, 27974, 30535, 55025, 61070, 69935, 110050, 139870, 152675, 305350, 349675, 433597, 699350, 867194, 2167985, 4335970, 10839925, 21679850]

約数ペア:

[(1, 21679850), (2, 10839925), (5, 4335970), (10, 2167985), (25, 867194), (31, 699350), (50, 433597), (62, 349675), (71, 305350), (142, 152675), (155, 139870), (197, 110050), (310, 69935), (355, 61070), (394, 55025), (710, 30535), (775, 27974), (985, 22010), (1550, 13987), (1775, 12214), (1970, 11005), (2201, 9850), (3550, 6107), (4402, 4925)]