21451563

素因数分解:

$3^2\times 7^3\times {\mathrm{6949}}^1$

素因数の和:6976

約数の個数: 24

約数和(自身を含む): 36140000

約数和(自身を除く): 14688437

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 343, 441, 1029, 3087, 6949, 20847, 48643, 62541, 145929, 340501, 437787, 1021503, 2383507, 3064509, 7150521, 21451563]

約数ペア:

[(1, 21451563), (3, 7150521), (7, 3064509), (9, 2383507), (21, 1021503), (49, 437787), (63, 340501), (147, 145929), (343, 62541), (441, 48643), (1029, 20847), (3087, 6949)]