21640428

素因数分解:

$2^2\times 3^2\times {\mathrm{257}}^1\times {\mathrm{2339}}^1$

素因数の和:2606

約数の個数: 36

約数和(自身を含む): 54938520

約数和(自身を除く): 33298092

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 257, 514, 771, 1028, 1542, 2313, 2339, 3084, 4626, 4678, 7017, 9252, 9356, 14034, 21051, 28068, 42102, 84204, 601123, 1202246, 1803369, 2404492, 3606738, 5410107, 7213476, 10820214, 21640428]

約数ペア:

[(1, 21640428), (2, 10820214), (3, 7213476), (4, 5410107), (6, 3606738), (9, 2404492), (12, 1803369), (18, 1202246), (36, 601123), (257, 84204), (514, 42102), (771, 28068), (1028, 21051), (1542, 14034), (2313, 9356), (2339, 9252), (3084, 7017), (4626, 4678)]