20640753

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 35747712

約数和(自身を除く): 15106959

約数列:

[1, 3, 7, 9, 21, 41, 61, 63, 123, 131, 183, 287, 369, 393, 427, 549, 861, 917, 1179, 1281, 2501, 2583, 2751, 3843, 5371, 7503, 7991, 8253, 16113, 17507, 22509, 23973, 37597, 48339, 52521, 55937, 71919, 112791, 157563, 167811, 327631, 338373, 503433, 982893, 2293417, 2948679, 6880251, 20640753]

約数ペア:

[(1, 20640753), (3, 6880251), (7, 2948679), (9, 2293417), (21, 982893), (41, 503433), (61, 338373), (63, 327631), (123, 167811), (131, 157563), (183, 112791), (287, 71919), (369, 55937), (393, 52521), (427, 48339), (549, 37597), (861, 23973), (917, 22509), (1179, 17507), (1281, 16113), (2501, 8253), (2583, 7991), (2751, 7503), (3843, 5371)]