20687751

素因数分解:

$3^3\times 7^2\times {\mathrm{19}}^1\times {\mathrm{823}}^1$

素因数の和:865

約数の個数: 48

約数和(自身を含む): 37574400

約数和(自身を除く): 16886649

約数列:

[1, 3, 7, 9, 19, 21, 27, 49, 57, 63, 133, 147, 171, 189, 399, 441, 513, 823, 931, 1197, 1323, 2469, 2793, 3591, 5761, 7407, 8379, 15637, 17283, 22221, 25137, 40327, 46911, 51849, 109459, 120981, 140733, 155547, 328377, 362943, 422199, 766213, 985131, 1088829, 2298639, 2955393, 6895917, 20687751]

約数ペア:

[(1, 20687751), (3, 6895917), (7, 2955393), (9, 2298639), (19, 1088829), (21, 985131), (27, 766213), (49, 422199), (57, 362943), (63, 328377), (133, 155547), (147, 140733), (171, 120981), (189, 109459), (399, 51849), (441, 46911), (513, 40327), (823, 25137), (931, 22221), (1197, 17283), (1323, 15637), (2469, 8379), (2793, 7407), (3591, 5761)]