20899840

素因数分解:

$2^{11}\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1$

素因数の和:197

約数の個数: 96

約数和(自身を含む): 54348840

約数和(自身を除く): 33449000

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 157, 160, 208, 256, 260, 314, 320, 416, 512, 520, 628, 640, 785, 832, 1024, 1040, 1256, 1280, 1570, 1664, 2041, 2048, 2080, 2512, 2560, 3140, 3328, 4082, 4160, 5024, 5120, 6280, 6656, 8164, 8320, 10048, 10205, 10240, 12560, 13312, 16328, 16640, 20096, 20410, 25120, 26624, 32656, 33280, 40192, 40820, 50240, 65312, 66560, 80384, 81640, 100480, 130624, 133120, 160768, 163280, 200960, 261248, 321536, 326560, 401920, 522496, 653120, 803840, 1044992, 1306240, 1607680, 2089984, 2612480, 4179968, 5224960, 10449920, 20899840]

約数ペア:

[(1, 20899840), (2, 10449920), (4, 5224960), (5, 4179968), (8, 2612480), (10, 2089984), (13, 1607680), (16, 1306240), (20, 1044992), (26, 803840), (32, 653120), (40, 522496), (52, 401920), (64, 326560), (65, 321536), (80, 261248), (104, 200960), (128, 163280), (130, 160768), (157, 133120), (160, 130624), (208, 100480), (256, 81640), (260, 80384), (314, 66560), (320, 65312), (416, 50240), (512, 40820), (520, 40192), (628, 33280), (640, 32656), (785, 26624), (832, 25120), (1024, 20410), (1040, 20096), (1256, 16640), (1280, 16328), (1570, 13312), (1664, 12560), (2041, 10240), (2048, 10205), (2080, 10048), (2512, 8320), (2560, 8164), (3140, 6656), (3328, 6280), (4082, 5120), (4160, 5024)]