21061425

素因数分解:

$3^1\times 5^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{521}}^1$

素因数の和:559

約数の個数: 72

約数和(自身を含む): 44273952

約数和(自身を除く): 23212527

約数列:

[1, 3, 5, 7, 11, 15, 21, 25, 33, 35, 49, 55, 75, 77, 105, 147, 165, 175, 231, 245, 275, 385, 521, 525, 539, 735, 825, 1155, 1225, 1563, 1617, 1925, 2605, 2695, 3647, 3675, 5731, 5775, 7815, 8085, 10941, 13025, 13475, 17193, 18235, 25529, 28655, 39075, 40117, 40425, 54705, 76587, 85965, 91175, 120351, 127645, 143275, 200585, 273525, 280819, 382935, 429825, 601755, 638225, 842457, 1002925, 1404095, 1914675, 3008775, 4212285, 7020475, 21061425]

約数ペア:

[(1, 21061425), (3, 7020475), (5, 4212285), (7, 3008775), (11, 1914675), (15, 1404095), (21, 1002925), (25, 842457), (33, 638225), (35, 601755), (49, 429825), (55, 382935), (75, 280819), (77, 273525), (105, 200585), (147, 143275), (165, 127645), (175, 120351), (231, 91175), (245, 85965), (275, 76587), (385, 54705), (521, 40425), (525, 40117), (539, 39075), (735, 28655), (825, 25529), (1155, 18235), (1225, 17193), (1563, 13475), (1617, 13025), (1925, 10941), (2605, 8085), (2695, 7815), (3647, 5775), (3675, 5731)]