18915813

素因数分解:

$3^2\times 7^2\times {\mathrm{59}}^1\times {\mathrm{727}}^1$

素因数の和:806

約数の個数: 36

約数和(自身を含む): 32366880

約数和(自身を除く): 13451067

約数列:

[1, 3, 7, 9, 21, 49, 59, 63, 147, 177, 413, 441, 531, 727, 1239, 2181, 2891, 3717, 5089, 6543, 8673, 15267, 26019, 35623, 42893, 45801, 106869, 128679, 300251, 320607, 386037, 900753, 2101757, 2702259, 6305271, 18915813]

約数ペア:

[(1, 18915813), (3, 6305271), (7, 2702259), (9, 2101757), (21, 900753), (49, 386037), (59, 320607), (63, 300251), (147, 128679), (177, 106869), (413, 45801), (441, 42893), (531, 35623), (727, 26019), (1239, 15267), (2181, 8673), (2891, 6543), (3717, 5089)]