21503781

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:234

約数の個数: 48

約数和(自身を含む): 35747712

約数和(自身を除く): 14243931

約数列:

[1, 3, 9, 13, 23, 39, 61, 69, 117, 131, 183, 207, 299, 393, 549, 793, 897, 1179, 1403, 1703, 2379, 2691, 3013, 4209, 5109, 7137, 7991, 9039, 12627, 15327, 18239, 23973, 27117, 39169, 54717, 71919, 103883, 117507, 164151, 183793, 311649, 352521, 551379, 934947, 1654137, 2389309, 7167927, 21503781]

約数ペア:

[(1, 21503781), (3, 7167927), (9, 2389309), (13, 1654137), (23, 934947), (39, 551379), (61, 352521), (69, 311649), (117, 183793), (131, 164151), (183, 117507), (207, 103883), (299, 71919), (393, 54717), (549, 39169), (793, 27117), (897, 23973), (1179, 18239), (1403, 15327), (1703, 12627), (2379, 9039), (2691, 7991), (3013, 7137), (4209, 5109)]