21388965

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{251}}^1$

素因数の和:314

約数の個数: 64

約数和(自身を含む): 40642560

約数和(自身を除く): 19253595

約数列:

[1, 3, 5, 13, 15, 19, 23, 39, 57, 65, 69, 95, 115, 195, 247, 251, 285, 299, 345, 437, 741, 753, 897, 1235, 1255, 1311, 1495, 2185, 3263, 3705, 3765, 4485, 4769, 5681, 5773, 6555, 9789, 14307, 16315, 17043, 17319, 23845, 28405, 28865, 48945, 61997, 71535, 75049, 85215, 86595, 109687, 185991, 225147, 309985, 329061, 375245, 548435, 929955, 1125735, 1425931, 1645305, 4277793, 7129655, 21388965]

約数ペア:

[(1, 21388965), (3, 7129655), (5, 4277793), (13, 1645305), (15, 1425931), (19, 1125735), (23, 929955), (39, 548435), (57, 375245), (65, 329061), (69, 309985), (95, 225147), (115, 185991), (195, 109687), (247, 86595), (251, 85215), (285, 75049), (299, 71535), (345, 61997), (437, 48945), (741, 28865), (753, 28405), (897, 23845), (1235, 17319), (1255, 17043), (1311, 16315), (1495, 14307), (2185, 9789), (3263, 6555), (3705, 5773), (3765, 5681), (4485, 4769)]