20861440

素因数分解:

$2^9\times 5^1\times {\mathrm{29}}^1\times {\mathrm{281}}^1$

素因数の和:333

約数の個数: 80

約数和(自身を含む): 51927480

約数和(自身を除く): 31066040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 32, 40, 58, 64, 80, 116, 128, 145, 160, 232, 256, 281, 290, 320, 464, 512, 562, 580, 640, 928, 1124, 1160, 1280, 1405, 1856, 2248, 2320, 2560, 2810, 3712, 4496, 4640, 5620, 7424, 8149, 8992, 9280, 11240, 14848, 16298, 17984, 18560, 22480, 32596, 35968, 37120, 40745, 44960, 65192, 71936, 74240, 81490, 89920, 130384, 143872, 162980, 179840, 260768, 325960, 359680, 521536, 651920, 719360, 1043072, 1303840, 2086144, 2607680, 4172288, 5215360, 10430720, 20861440]

約数ペア:

[(1, 20861440), (2, 10430720), (4, 5215360), (5, 4172288), (8, 2607680), (10, 2086144), (16, 1303840), (20, 1043072), (29, 719360), (32, 651920), (40, 521536), (58, 359680), (64, 325960), (80, 260768), (116, 179840), (128, 162980), (145, 143872), (160, 130384), (232, 89920), (256, 81490), (281, 74240), (290, 71936), (320, 65192), (464, 44960), (512, 40745), (562, 37120), (580, 35968), (640, 32596), (928, 22480), (1124, 18560), (1160, 17984), (1280, 16298), (1405, 14848), (1856, 11240), (2248, 9280), (2320, 8992), (2560, 8149), (2810, 7424), (3712, 5620), (4496, 4640)]