21290955

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{31}}^2\times {\mathrm{211}}^1$

素因数の和:288

約数の個数: 48

約数和(自身を含む): 40419072

約数和(自身を除く): 19128117

約数列:

[1, 3, 5, 7, 15, 21, 31, 35, 93, 105, 155, 211, 217, 465, 633, 651, 961, 1055, 1085, 1477, 2883, 3165, 3255, 4431, 4805, 6541, 6727, 7385, 14415, 19623, 20181, 22155, 32705, 33635, 45787, 98115, 100905, 137361, 202771, 228935, 608313, 686805, 1013855, 1419397, 3041565, 4258191, 7096985, 21290955]

約数ペア:

[(1, 21290955), (3, 7096985), (5, 4258191), (7, 3041565), (15, 1419397), (21, 1013855), (31, 686805), (35, 608313), (93, 228935), (105, 202771), (155, 137361), (211, 100905), (217, 98115), (465, 45787), (633, 33635), (651, 32705), (961, 22155), (1055, 20181), (1085, 19623), (1477, 14415), (2883, 7385), (3165, 6727), (3255, 6541), (4431, 4805)]