20871747

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{229}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 35162400

約数和(自身を除く): 14290653

約数列:

[1, 3, 9, 13, 19, 39, 41, 57, 117, 123, 171, 229, 247, 369, 533, 687, 741, 779, 1599, 2061, 2223, 2337, 2977, 4351, 4797, 7011, 8931, 9389, 10127, 13053, 26793, 28167, 30381, 39159, 56563, 84501, 91143, 122057, 169689, 178391, 366171, 509067, 535173, 1098513, 1605519, 2319083, 6957249, 20871747]

約数ペア:

[(1, 20871747), (3, 6957249), (9, 2319083), (13, 1605519), (19, 1098513), (39, 535173), (41, 509067), (57, 366171), (117, 178391), (123, 169689), (171, 122057), (229, 91143), (247, 84501), (369, 56563), (533, 39159), (687, 30381), (741, 28167), (779, 26793), (1599, 13053), (2061, 10127), (2223, 9389), (2337, 8931), (2977, 7011), (4351, 4797)]