21510520

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{227}}^1$

素因数の和:364

約数の個数: 64

約数和(自身を含む): 51217920

約数和(自身を除く): 29707400

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 103, 115, 184, 206, 227, 230, 412, 454, 460, 515, 824, 908, 920, 1030, 1135, 1816, 2060, 2270, 2369, 4120, 4540, 4738, 5221, 9080, 9476, 10442, 11845, 18952, 20884, 23381, 23690, 26105, 41768, 46762, 47380, 52210, 93524, 94760, 104420, 116905, 187048, 208840, 233810, 467620, 537763, 935240, 1075526, 2151052, 2688815, 4302104, 5377630, 10755260, 21510520]

約数ペア:

[(1, 21510520), (2, 10755260), (4, 5377630), (5, 4302104), (8, 2688815), (10, 2151052), (20, 1075526), (23, 935240), (40, 537763), (46, 467620), (92, 233810), (103, 208840), (115, 187048), (184, 116905), (206, 104420), (227, 94760), (230, 93524), (412, 52210), (454, 47380), (460, 46762), (515, 41768), (824, 26105), (908, 23690), (920, 23381), (1030, 20884), (1135, 18952), (1816, 11845), (2060, 10442), (2270, 9476), (2369, 9080), (4120, 5221), (4540, 4738)]