21520905

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{2113}}^1$

素因数の和:2225

約数の個数: 32

約数和(自身を含む): 39777024

約数和(自身を除く): 18256119

約数列:

[1, 3, 5, 7, 15, 21, 35, 97, 105, 291, 485, 679, 1455, 2037, 2113, 3395, 6339, 10185, 10565, 14791, 31695, 44373, 73955, 204961, 221865, 614883, 1024805, 1434727, 3074415, 4304181, 7173635, 21520905]

約数ペア:

[(1, 21520905), (3, 7173635), (5, 4304181), (7, 3074415), (15, 1434727), (21, 1024805), (35, 614883), (97, 221865), (105, 204961), (291, 73955), (485, 44373), (679, 31695), (1455, 14791), (2037, 10565), (2113, 10185), (3395, 6339)]