21505880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{1321}}^1$

素因数の和:1380

約数の個数: 64

約数和(自身を含む): 54254880

約数和(自身を除く): 32749000

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 37, 40, 44, 55, 74, 88, 110, 148, 185, 220, 296, 370, 407, 440, 740, 814, 1321, 1480, 1628, 2035, 2642, 3256, 4070, 5284, 6605, 8140, 10568, 13210, 14531, 16280, 26420, 29062, 48877, 52840, 58124, 72655, 97754, 116248, 145310, 195508, 244385, 290620, 391016, 488770, 537647, 581240, 977540, 1075294, 1955080, 2150588, 2688235, 4301176, 5376470, 10752940, 21505880]

約数ペア:

[(1, 21505880), (2, 10752940), (4, 5376470), (5, 4301176), (8, 2688235), (10, 2150588), (11, 1955080), (20, 1075294), (22, 977540), (37, 581240), (40, 537647), (44, 488770), (55, 391016), (74, 290620), (88, 244385), (110, 195508), (148, 145310), (185, 116248), (220, 97754), (296, 72655), (370, 58124), (407, 52840), (440, 48877), (740, 29062), (814, 26420), (1321, 16280), (1480, 14531), (1628, 13210), (2035, 10568), (2642, 8140), (3256, 6605), (4070, 5284)]