21320805

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{691}}^1$

素因数の和:738

約数の個数: 48

約数和(自身を含む): 39759552

約数和(自身を除く): 18438747

約数列:

[1, 3, 5, 11, 15, 17, 33, 51, 55, 85, 121, 165, 187, 255, 363, 561, 605, 691, 935, 1815, 2057, 2073, 2805, 3455, 6171, 7601, 10285, 10365, 11747, 22803, 30855, 35241, 38005, 58735, 83611, 114015, 129217, 176205, 250833, 387651, 418055, 646085, 1254165, 1421387, 1938255, 4264161, 7106935, 21320805]

約数ペア:

[(1, 21320805), (3, 7106935), (5, 4264161), (11, 1938255), (15, 1421387), (17, 1254165), (33, 646085), (51, 418055), (55, 387651), (85, 250833), (121, 176205), (165, 129217), (187, 114015), (255, 83611), (363, 58735), (561, 38005), (605, 35241), (691, 30855), (935, 22803), (1815, 11747), (2057, 10365), (2073, 10285), (2805, 7601), (3455, 6171)]