20387840

素因数分解:

$2^{11}\times 5^1\times {\mathrm{11}}^1\times {\mathrm{181}}^1$

素因数の和:219

約数の個数: 96

約数和(自身を含む): 53660880

約数和(自身を除く): 33273040

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 64, 80, 88, 110, 128, 160, 176, 181, 220, 256, 320, 352, 362, 440, 512, 640, 704, 724, 880, 905, 1024, 1280, 1408, 1448, 1760, 1810, 1991, 2048, 2560, 2816, 2896, 3520, 3620, 3982, 5120, 5632, 5792, 7040, 7240, 7964, 9955, 10240, 11264, 11584, 14080, 14480, 15928, 19910, 22528, 23168, 28160, 28960, 31856, 39820, 46336, 56320, 57920, 63712, 79640, 92672, 112640, 115840, 127424, 159280, 185344, 231680, 254848, 318560, 370688, 463360, 509696, 637120, 926720, 1019392, 1274240, 1853440, 2038784, 2548480, 4077568, 5096960, 10193920, 20387840]

約数ペア:

[(1, 20387840), (2, 10193920), (4, 5096960), (5, 4077568), (8, 2548480), (10, 2038784), (11, 1853440), (16, 1274240), (20, 1019392), (22, 926720), (32, 637120), (40, 509696), (44, 463360), (55, 370688), (64, 318560), (80, 254848), (88, 231680), (110, 185344), (128, 159280), (160, 127424), (176, 115840), (181, 112640), (220, 92672), (256, 79640), (320, 63712), (352, 57920), (362, 56320), (440, 46336), (512, 39820), (640, 31856), (704, 28960), (724, 28160), (880, 23168), (905, 22528), (1024, 19910), (1280, 15928), (1408, 14480), (1448, 14080), (1760, 11584), (1810, 11264), (1991, 10240), (2048, 9955), (2560, 7964), (2816, 7240), (2896, 7040), (3520, 5792), (3620, 5632), (3982, 5120)]