21098240

素因数分解:

$2^8\times 5^1\times {\mathrm{53}}^1\times {\mathrm{311}}^1$

素因数の和:385

約数の個数: 72

約数和(自身を含む): 51655968

約数和(自身を除く): 30557728

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 53, 64, 80, 106, 128, 160, 212, 256, 265, 311, 320, 424, 530, 622, 640, 848, 1060, 1244, 1280, 1555, 1696, 2120, 2488, 3110, 3392, 4240, 4976, 6220, 6784, 8480, 9952, 12440, 13568, 16483, 16960, 19904, 24880, 32966, 33920, 39808, 49760, 65932, 67840, 79616, 82415, 99520, 131864, 164830, 199040, 263728, 329660, 398080, 527456, 659320, 1054912, 1318640, 2109824, 2637280, 4219648, 5274560, 10549120, 21098240]

約数ペア:

[(1, 21098240), (2, 10549120), (4, 5274560), (5, 4219648), (8, 2637280), (10, 2109824), (16, 1318640), (20, 1054912), (32, 659320), (40, 527456), (53, 398080), (64, 329660), (80, 263728), (106, 199040), (128, 164830), (160, 131864), (212, 99520), (256, 82415), (265, 79616), (311, 67840), (320, 65932), (424, 49760), (530, 39808), (622, 33920), (640, 32966), (848, 24880), (1060, 19904), (1244, 16960), (1280, 16483), (1555, 13568), (1696, 12440), (2120, 9952), (2488, 8480), (3110, 6784), (3392, 6220), (4240, 4976)]