18990916

素因数分解:

$2^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{797}}^1$

素因数の和:868

約数の個数: 48

約数和(自身を含む): 40755456

約数和(自身を除く): 21764540

約数列:

[1, 2, 4, 7, 14, 23, 28, 37, 46, 74, 92, 148, 161, 259, 322, 518, 644, 797, 851, 1036, 1594, 1702, 3188, 3404, 5579, 5957, 11158, 11914, 18331, 22316, 23828, 29489, 36662, 58978, 73324, 117956, 128317, 206423, 256634, 412846, 513268, 678247, 825692, 1356494, 2712988, 4747729, 9495458, 18990916]

約数ペア:

[(1, 18990916), (2, 9495458), (4, 4747729), (7, 2712988), (14, 1356494), (23, 825692), (28, 678247), (37, 513268), (46, 412846), (74, 256634), (92, 206423), (148, 128317), (161, 117956), (259, 73324), (322, 58978), (518, 36662), (644, 29489), (797, 23828), (851, 22316), (1036, 18331), (1594, 11914), (1702, 11158), (3188, 5957), (3404, 5579)]