21489741

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1381}}^1$

素因数の和:1426

約数の個数: 48

約数和(自身を含む): 40243840

約数和(自身を除く): 18754099

約数列:

[1, 3, 7, 9, 13, 19, 21, 39, 57, 63, 91, 117, 133, 171, 247, 273, 399, 741, 819, 1197, 1381, 1729, 2223, 4143, 5187, 9667, 12429, 15561, 17953, 26239, 29001, 53859, 78717, 87003, 125671, 161577, 183673, 236151, 341107, 377013, 551019, 1023321, 1131039, 1653057, 2387749, 3069963, 7163247, 21489741]

約数ペア:

[(1, 21489741), (3, 7163247), (7, 3069963), (9, 2387749), (13, 1653057), (19, 1131039), (21, 1023321), (39, 551019), (57, 377013), (63, 341107), (91, 236151), (117, 183673), (133, 161577), (171, 125671), (247, 87003), (273, 78717), (399, 53859), (741, 29001), (819, 26239), (1197, 17953), (1381, 15561), (1729, 12429), (2223, 9667), (4143, 5187)]