20998720

素因数分解:

$2^6\times 5^1\times {\mathrm{211}}^1\times {\mathrm{311}}^1$

素因数の和:539

約数の個数: 56

約数和(自身を含む): 50401728

約数和(自身を除く): 29403008

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 211, 311, 320, 422, 622, 844, 1055, 1244, 1555, 1688, 2110, 2488, 3110, 3376, 4220, 4976, 6220, 6752, 8440, 9952, 12440, 13504, 16880, 19904, 24880, 33760, 49760, 65621, 67520, 99520, 131242, 262484, 328105, 524968, 656210, 1049936, 1312420, 2099872, 2624840, 4199744, 5249680, 10499360, 20998720]

約数ペア:

[(1, 20998720), (2, 10499360), (4, 5249680), (5, 4199744), (8, 2624840), (10, 2099872), (16, 1312420), (20, 1049936), (32, 656210), (40, 524968), (64, 328105), (80, 262484), (160, 131242), (211, 99520), (311, 67520), (320, 65621), (422, 49760), (622, 33760), (844, 24880), (1055, 19904), (1244, 16880), (1555, 13504), (1688, 12440), (2110, 9952), (2488, 8440), (3110, 6752), (3376, 6220), (4220, 4976)]