20121969

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:142

約数の個数: 64

約数和(自身を含む): 35020800

約数和(自身を除く): 14898831

約数列:

[1, 3, 7, 19, 21, 29, 37, 47, 57, 87, 111, 133, 141, 203, 259, 329, 399, 551, 609, 703, 777, 893, 987, 1073, 1363, 1653, 1739, 2109, 2679, 3219, 3857, 4089, 4921, 5217, 6251, 7511, 9541, 11571, 12173, 14763, 18753, 20387, 22533, 25897, 28623, 33041, 36519, 50431, 61161, 77691, 99123, 142709, 151293, 181279, 231287, 353017, 428127, 543837, 693861, 958189, 1059051, 2874567, 6707323, 20121969]

約数ペア:

[(1, 20121969), (3, 6707323), (7, 2874567), (19, 1059051), (21, 958189), (29, 693861), (37, 543837), (47, 428127), (57, 353017), (87, 231287), (111, 181279), (133, 151293), (141, 142709), (203, 99123), (259, 77691), (329, 61161), (399, 50431), (551, 36519), (609, 33041), (703, 28623), (777, 25897), (893, 22533), (987, 20387), (1073, 18753), (1363, 14763), (1653, 12173), (1739, 11571), (2109, 9541), (2679, 7511), (3219, 6251), (3857, 5217), (4089, 4921)]