18989971

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{311}}^1$

素因数の和:403

約数の個数: 32

約数和(自身を含む): 25998336

約数和(自身を除く): 7008365

約数列:

[1, 7, 11, 13, 61, 77, 91, 143, 311, 427, 671, 793, 1001, 2177, 3421, 4043, 4697, 5551, 8723, 18971, 23947, 28301, 44473, 61061, 132797, 208681, 246623, 311311, 1460767, 1726361, 2712853, 18989971]

約数ペア:

[(1, 18989971), (7, 2712853), (11, 1726361), (13, 1460767), (61, 311311), (77, 246623), (91, 208681), (143, 132797), (311, 61061), (427, 44473), (671, 28301), (793, 23947), (1001, 18971), (2177, 8723), (3421, 5551), (4043, 4697)]