21664825

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{107}}^1$

素因数の和:226

約数の個数: 48

約数和(自身を含む): 33747840

約数和(自身を除く): 12083015

約数列:

[1, 5, 7, 13, 25, 35, 65, 89, 91, 107, 175, 325, 445, 455, 535, 623, 749, 1157, 1391, 2225, 2275, 2675, 3115, 3745, 5785, 6955, 8099, 9523, 9737, 15575, 18725, 28925, 34775, 40495, 47615, 48685, 66661, 123799, 202475, 238075, 243425, 333305, 618995, 866593, 1666525, 3094975, 4332965, 21664825]

約数ペア:

[(1, 21664825), (5, 4332965), (7, 3094975), (13, 1666525), (25, 866593), (35, 618995), (65, 333305), (89, 243425), (91, 238075), (107, 202475), (175, 123799), (325, 66661), (445, 48685), (455, 47615), (535, 40495), (623, 34775), (749, 28925), (1157, 18725), (1391, 15575), (2225, 9737), (2275, 9523), (2675, 8099), (3115, 6955), (3745, 5785)]