21041920

素因数分解:

$2^8\times 5^1\times {\mathrm{17}}^1\times {\mathrm{967}}^1$

素因数の和:1005

約数の個数: 72

約数和(自身を含む): 53421984

約数和(自身を除く): 32380064

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 256, 272, 320, 340, 544, 640, 680, 967, 1088, 1280, 1360, 1934, 2176, 2720, 3868, 4352, 4835, 5440, 7736, 9670, 10880, 15472, 16439, 19340, 21760, 30944, 32878, 38680, 61888, 65756, 77360, 82195, 123776, 131512, 154720, 164390, 247552, 263024, 309440, 328780, 526048, 618880, 657560, 1052096, 1237760, 1315120, 2104192, 2630240, 4208384, 5260480, 10520960, 21041920]

約数ペア:

[(1, 21041920), (2, 10520960), (4, 5260480), (5, 4208384), (8, 2630240), (10, 2104192), (16, 1315120), (17, 1237760), (20, 1052096), (32, 657560), (34, 618880), (40, 526048), (64, 328780), (68, 309440), (80, 263024), (85, 247552), (128, 164390), (136, 154720), (160, 131512), (170, 123776), (256, 82195), (272, 77360), (320, 65756), (340, 61888), (544, 38680), (640, 32878), (680, 30944), (967, 21760), (1088, 19340), (1280, 16439), (1360, 15472), (1934, 10880), (2176, 9670), (2720, 7736), (3868, 5440), (4352, 4835)]